| Name | Description/focus | Date launched | Registered users | Registration | Global Alexa[1] page ranking | 
| 43 Things | Goal setting and achievement | 000000002005-01-01-00001 January 2005 | 7006300000000000000♠3,000,000[2] | Closed | 7004129140000000000♠12,914[3] | 
| Academia.edu | Social networking site for academics/researchers | 000000002008-09-01-0000September 2008 | 7007180000000000000♠18,000,000[4] | Open | 7002824000000000000♠824[5] | 
| About.me | Social networking site | 000000002009-10-01-0000October 2009 | 7006500000000000000♠5,000,000[6] | Open | 7003144700000000000♠1,447 | 
| Advogato | Free and open source software developers | 000000001999-01-01-00001999 | 7004135750000000000♠13,575[7] | Open | 7005292620000000000♠292,620[8] | 
| aNobii | Books | 000000002006-01-01-00002006 |  | Open | 7004269390000000000♠26,939[9] | 
| AsianAvenue | A social network for the Asian American community | 000000001997-01-01-00001997 |  | Open | 7005170384000000000♠170,384[10] | 
| aSmallWorld | European jet set and social elite world-wide | 000000002004-03-01-0000March 2004 | 7005550000000000000♠550,000[11] | Invite-only | 7005580060000000000♠580,060[12] | 
| Athlinks | Running, swimming | 000000002001-01-01-00002001 | 7005139458000000000♠139,458[13] | Open | 7004691700000000000♠69,170[14] | 
| Audimated.com | Independent music | 000000002010-01-01-00002010 |  | Open | 7005656507000000000♠656,507[15] | 
| Bebo | General | 000000002005-07-01-0000July 2005 | 7008117000000000000♠117,000,000[16] | Open to people 13 and older | 7003416900000000000♠4,169[17] | 
| Biip.no | Norwegian community | 000000002005-06-01-00001 June 2005 | 7005430000000000000♠430,000[18] | Requires Norwegian phone number | 7004819160000000000♠81,916[19] | 
| BlackPlanet | Black Americans | 000000001999-09-01-00001 September 1999 | 7007200000000000000♠20,000,000[20] | Open | 7003719300000000000♠7,193[21] | 
| Bolt.com | General | 000000001996-01-01-00001996 |  | Open | 7005589595000000000♠589,595[22] | 
| Busuu | Language learning community (headquartered in Madrid, Spain) | 000000002008-05-16-000016 May 2008 | 7007120000000000000♠12,000,000[23] | Open | 7003497600000000000♠4,976[24] | 
| Buzznet | Music and pop-culture | 000000002005-01-01-00002005 | 7007100000000000000♠10,000,000[25] | Open | 7003695500000000000♠6,955[26] | 
| CafeMom | Mothers | 000000002006-12-01-0000December 2006 | 7006125000000000000♠1,250,000[27] | Open to moms and moms-to-be | 7003129300000000000♠1,293[28] | 
| Care2 | Green living and social activism | 000000001998-01-01-00001998 | 7006996194700000000♠9,961,947[29] | Open | 7003193000000000000♠1,930[30] | 
| CaringBridge | Not for profit providing free websites that connect family and friends during a serious health event, care and recovery.[31] | 000000001997-01-01-00001997 | 7006950000000000000♠9,500,000[32] | Open to people 18 and older[33] | 7003427900000000000♠4,279[34] | 
| Classmates.com | School, college, work and the military | 000000001995-01-01-00001995 | 7007500000000000000♠50,000,000[35] | Open to people 18 and older[36] | 7003328400000000000♠3,284[37] | 
| Cloob | General. Popular in Iran | 000000002004-01-01-00002004 |  | Open | 7002749000000000000♠749[38] | 
| ClusterFlunk | American network for students to share files with their peers | 000000002012-01-01-00002012 |  |  | 7005545917000000000♠545,917[39] | 
| CouchSurfing | Worldwide network for making connections between travelers and the communities they visit. | 000000002003-01-01-00002003 | 7006296742100000000♠2,967,421[40] | Open | 7003223100000000000♠2,231[41] | 
| CozyCot | East Asian and Southeast Asian women | 000000002001-01-01-00002001 | 7005150000000000000♠150,000[42] | Open | 7004369590000000000♠36,959[43] | 
| Cross.tv | Faith-based social network for Christian believers from around the world | 000000002008-01-01-00002008 | 7005450000000000000♠450,000[44] | Open | 7004533940000000000♠53,394[45] | 
| Crunchyroll | Anime and forums. | 000000002006-01-01-00002006 |  | Open | 7003572100000000000♠5,721[46] | 
| Cucumbertown | Networking for cooks | 000000002012-01-01-00002012 |  | Open | 7005175796000000000♠175,796[47] | 
| Cyworld | General. Popular in South Korea. | 000000001999-01-01-00001999 | 7007240000000000000♠24,000,000[48] | Open | 7003161600000000000♠1,616[49] | 
| DailyBooth | Photo-blogging site where users upload a photo every day | 000000002009-02-13-000013 February 2009 |  | Closed | 7003596300000000000♠5,963[50] | 
| DailyStrength | Medical & emotional support community - physical health, mental health, support groups | 000000002007-11-04-00004 November 2007 |  | Open | 7004105110000000000♠10,511[51] | 
| delicious | Social bookmarking allowing users to locate and save websites that match their own interests | 000000002003-09-01-0000September 2003 | 7006882292100000000♠8,822,921[52] | Open | 7002436000000000000♠436[53] | 
| DeviantArt | Art community | 000000002000-08-07-00007 August 2000 | 7007260000000000000♠26,000,000[54] | Open to people 13 and older | 7002131000000000000♠131[55] | 
| Diaspora* | Decentralized, privacy aware, general (open source) | 000000002010-11-01-0000November 2010 | 7005370000000000000♠370,000+[n 1][56] | Open | 7004367920000000000♠36,792[n 2][57] | 
| Disaboom | People with disabilities (amputees, cerebral palsy, MS, and other disabilities) | 000000002007-01-01-00002007 |  | Open | 7005218135000000000♠218,135[58] | 
| Dol2day | Politic community, social network, Internet radio (German-speaking countries) | 000000002000-05-15-000015 May 2000 | 7004402000000000000♠40,200[59] | Open | 7005385237000000000♠385,237[60] | 
| DontStayIn | Clubbing (primarily UK) | 000000002003-04-01-0000April 2003 |  | Open | 7004865350000000000♠86,535[61] | 
| Draugiem.lv | General (primarily LV, LT, HU) | 000000002004-04-24-0000April 24, 2004 | 7006260046600000000♠2,600,466[62] | Invitation only | 7003269800000000000♠2,698[63] | 
| douban | Chinese Web 2.0 website providing user review and recommendation services for movies, books, and music. | 000000002005-01-01-00002005 | 7007468500000000000♠46,850,000[64] | Open | 7002106000000000000♠106[65] | 
| Doximity | U.S. Physicians and medical doctors. | 000000002011-01-01-00002011 | 7005400000000000000♠400,000[66] | U.S. physicians only | 7004275390000000000♠27,539[67] | 
| Dreamwidth | Blogging. | 000000002009-01-01-00002009 |  | Open | 7003638400000000000♠6,384[68] | 
| DXY.cn | Chinese online community for physicians, health care professionals, pharmacies and facilities | 000000002000-01-01-00002000[69] | 7006200000000000000♠2,000,000[70] | Open | 7003836700000000000♠8,367[71] | 
| Elftown | Community and wiki around fantasy and sci-fi. | 000000002002-02-01-0000Feb 2002 | 7005185000000000000♠185,000[72] | Open, approval needed | 7004432770000000000♠43,277[73] | 
| Ello | General | 000000002014-03-01-0000March 2014[74][75] |  | Invite only while in beta | 7005106782000000000♠106,782[76] | 
| Elixio | Business executives jet set and global elite. | 000000002007-07-01-0000July 2007 | 7004800000000000000♠80,000[77] | Invite-only | 7005545268000000000♠545,268[78] | 
| English, baby! | Students and teachers of English as a second language | 000000002000-01-01-00002000 | 7006160000000000000♠1,600,000[79] | Open | 7004295850000000000♠29,585[80] | 
| Epernicus | For research scientists |  |  | Open | 7005798086000000000♠798,086[81] | 
| Eons.com | For baby boomers and mature internet users age 40 and beyond. | 000000002006-07-01-0000Jul 2006 |  | Open to people age 40 years and older | 7004737670000000000♠73,767[82] | 
| eToro | Social investing, finance | 000000002007-05-01-0000May 2007 | 7006250000000000000♠2,500,000 | Open | 7003159100000000000♠1,591[83] | 
| Experience Project | Life experiences | 000000002007-01-01-00002007 |  | Open | 7003265800000000000♠2,658[84] | 
| Exploroo | Travel social networking. | 000000002009-05-12-000012 May 2009 |  | Open | 7005163545000000000♠163,545[85] | 
| Facebook | General: photos, videos, blogs, apps. | 000000002004-02-01-0000February 2004 | 7009128000000000000♠1,280,000,000[86] | Open to people 13 and older | 7000200000000000000♠2[87] | 
| Faceparty | General. Popular UK. | 000000002000-01-01-00002000 | 7005200000000000000♠200,000[88] | Invitation only to people 18 and older | 7005163639000000000♠163,639[89] | 
| Fetlife | People who are into BDSM | 000000002008-01-01-0000January 2008 | 7006270171500000000♠2,701,715[90] | Open to people "of legal age to see adult content" | 7003413100000000000♠4,131[91] | 
| FilmAffinity | Movies and TV series | 000000002002-01-01-00002002 | 7005250000000000000♠250,000[92] | Open | 7003315100000000000♠3,151[93] | 
| Filmow | Movies and TV series | 000000002009-01-01-00002009 |  | Open | 7004446300000000000♠44,630[94] | 
| FledgeWing | Entrepreneurial community targeted towards worldwide university students | 000000002009-02-01-0000Feb 2009 |  | Open to university students | 7005696513000000000♠696,513[95] | 
| Flixster | Movies | 000000002007-01-01-00002007 | 7007630000000000000♠63,000,000[96] | Open to people 13 and older | 7003401200000000000♠4,012[97] | 
| Flickr | Photo sharing, commenting, photography related networking, worldwide | 000000002004-02-01-0000February 2004 | 7007320000000000000♠32,000,000[98] | Open to people 13 and older (Yahoo! Login) | 7001480000000000000♠48[99] | 
| Focus.com | Business-to-business, worldwide | 000000002005-01-01-00002005 | 7005850000000000000♠850,000[100] | Open to people 13 and older | 7004121140000000000♠12,114[101] | 
| Fotki | Photo sharing, video hosting, photo contests, journals, forums, flexible privacy protection, friend's feed, audio comments and unlimited custom design integration. | 000000001998-10-01-0000October 1998 | 7006163256500000000♠1,632,565 | Open | 7003801100000000000♠8,011[102] | 
| Fotolog | Photoblogging. Popular in South America and Spain | 000000002002-01-01-00002002 | 7007200000000000000♠20,000,000[103] | Open | 7003316800000000000♠3,168[104] | 
| Foursquare | Location based mobile social network | 000000002009-01-01-00002009 | 7007200000000000000♠20,000,000[105] | Open | 7002817000000000000♠817[106] | 
| Friendica | Distributed, federated, privacy aware, open source, general | 000000002010-07-01-0000July 2010 |  | Open | 7005354946000000000♠354,946[107][n 2] | 
| Friends Reunited | UK based. School, college, work, sport and streets | 000000002000-07-01-0000July 2000 | 7007190000000000000♠19,000,000[108] | Open to people 13 and older | 7004292390000000000♠29,239[109] | 
| Friendster | General. Popular in Southeast Asia. No longer popular in the western world | 000000002002-01-01-00002002 | 7007900000000000000♠90,000,000[110] | Open to people 16 and older. | 7004121670000000000♠12,167[111] | 
| Fuelmyblog | Blogging community | 000000002007-07-01-0000July 2007 | 7004500000000000000♠50,000[112] | Open | 7004855470000000000♠85,547[113] | 
| Gaia Online | Anime and games. Popular in USA, Canada and Europe. Moderately popular around Asia. |  | 7007235236630000000♠23,523,663[114] | Open to people 13 and older | 7003627700000000000♠6,277[115] | 
| GamerDNA | Computer and video games | 000000002006-09-21-000021 September 2006 | 7005310000000000000♠310,000[116] | Open | 7004597300000000000♠59,730[117] | 
| Gapyear.com | Travel social network | 000000001998-07-01-0000July 1998 |  | Open | 7004747630000000000♠74,763[118] | 
| Gather.com | Article, picture, and video sharing, as well as group discussions | 000000002005-02-25-000025 Feb 2005 | 7005465000000000000♠465,000[119] | Open | 7003306200000000000♠3,062[120] | 
| Gays.com | Social network for LGBT community, guide for LGBT bars, restaurants, clubs, shopping | 000000002008-05-16-000016 May 2008 | 7005100000000000000♠100,000[121] | Open, global | 7005224302000000000♠224,302[122] | 
| Geni.com | Families, genealogy | 000000002007-01-16-000016 January 2007 | 7007150000000000000♠15,000,000[123] | Open | 7003595800000000000♠5,958[124] | 
| Gentlemint | Community for sharing and discussing all things manly | 000000002011-11-25-000025 November 2011 |  | Open | 7005100196000000000♠100,196[125] | 
| GetGlue | Social network for entertainment. | 000000002008-10-28-000028 October 2008 | 7006200000000000000♠2,000,000[126] | Open | 7003373500000000000♠3,735[127] | 
| GirlsAskGuys | Community where people help each other by sharing their experiences & opinions. | 000000002007-06-01-0000June 2007 | 7005450000000000000♠450,000[128] | Open | 7003479800000000000♠4,798[129] | 
| Gogoyoko | Fair play in music - social networking site for musicians and music lovers. | 000000002009-10-01-00001 Oct 2009 |  | Invite only while in beta | 7005145552000000000♠145,552[130] | 
| Goodreads | Library cataloging, book lovers. | 000000002006-12-01-0000December 2006 | 7007130000000000000♠13,000,000[131] | Open | 7002327000000000000♠327[132] | 
| Goodwizz | Social network with matchmaking and personality games to find new contacts. Global, based in France. | 000000002010-10-01-0000October 2010 | 7005110000000000000♠110,000[133][134] | Open | 7005597008000000000♠597,008[135] | 
| Google+ | General | 000000002011-06-28-000028 June 2011 | 7009160000000000000♠1,600,000,000[136] | Open to people 13 and older [137] | NA[n 3] | 
| GovLoop | For people in and around government. | 000000002008-05-01-0000May 2008 |  |  | 7005138576000000000♠138,576[138] | 
| Grono.net | Poland |  | 7006200000000000000♠2,000,000 | Open | 7005395036000000000♠395,036[139] | 
| Habbo | General for teens. Over 31 communities worldwide. Chat room and user profiles. | 000000002000-08-01-0000August 2000 | 7008268000000000000♠268,000,000[140][141][142] | Open to people 13 and older | 7004152550000000000♠15,255[143] | 
| hi5 | General. Popular in Nepal, Mongolia, Thailand, Romania, Jamaica, Central Africa, Portugal and Latin America. Not very popular in the USA. | 000000002003-01-01-00002003 | 7007800000000000000♠80,000,000[144] | Open to people 13 and older. | 7002902000000000000♠902[145] | 
| Hospitality Club | Hospitality |  | 7005328629000000000♠328,629[146] | Open | 7004995620000000000♠99,562[147] | 
| Hotlist | Geo-social aggregator rooted in the concept of knowing where users' friends are, were, and will be. |  | 7004800000000000000♠80,000[148] | Open | 7005155811000000000♠155,811[149] | 
| HR.com | Social networking site for human resources professionals. | 000000001999-01-01-00001999 | 7005194000000000000♠194,000[150] | Open | 7004795910000000000♠79,591[151] | 
| Hub Culture | Global influencers focused on worth creation. | 000000002002-11-01-0000November 2002 | 7004200000000000000♠20,000[152] | Invite-only | 7005152756000000000♠152,756[153] | 
| Ibibo | Talent based social networking site that allows to promote one's self and also discover new talent. Most popular in India. |  | 7006350000000000000♠3,500,000[154] | Open | 7003114300000000000♠1,143[155] | 
| Identi.ca | Twitter-like service popular with hackers and software freedom advocates. |  | 7005395695000000000♠395,695 | Open | 7003729000000000000♠7,290[156] | 
| Indaba Music | Online collaboration for musicians, remix contests, and networking. |  | 7005350000000000000♠350,000[157] | Open, global | 7004450390000000000♠45,039[158] | 
| Influenster | Online product sampling and review platform. | 000000002010-01-01-00002010 | 7005850000000000000♠850,000[159] | Open, global | 7003861200000000000♠8,612[160] | 
| Instagram | A photo and video sharing site. | 000000002010-10-01-0000October 2010 | 7008300000000000000♠300,000,000[161] | Open to anyone 13 or older | 7001410000000000000♠41 | 
| IRC-Galleria | Finland |  | 7005505000000000000♠505,000[162] | Open to Finnish speaking people 12 and older | 7004369820000000000♠36,982[163] | 
| italki.com | Language learning social network. 100+ languages. |  | 7005500000000000000♠500,000[164] | Open, global | 7004189560000000000♠18,956[165] | 
| Itsmy | Mobile community worldwide, blogging, friends, personal TV-shows |  | 7006250000000000000♠2,500,000[166] |  | 7005770100000000000♠770,100[167] | 
| iWiW | Hungary | 000000002002-04-14-000014 April 2002 | 7006400000000000000♠4,000,000[168] | Invite-only | 7003383100000000000♠3,831[169] | 
| Jaiku | General. Microblogging. Owned by Google | 000000002006-02-01-0000February 2006 |  | Open to people 13 and older | 7004629100000000000♠62,910[170] | 
| Jiepang | Location-based mobile social network. In Chinese language | 000000002010-01-01-00002010 | 7006300000000000000♠3,000,000[171] | Open | 7004147900000000000♠14,790[172] | 
| Kaixin001 | General. In Simplified Chinese; caters for mainland China users |  |  | Open to the general public | 7002284000000000000♠284[173] | 
| Kiwibox | General. | 000000001999-01-01-00001999 | 7006240000000000000♠2,400,000[174] | Open to people 13 and older | 7005104563000000000♠104,563[175] | 
| Lafango | Talent-focused media sharing site |  |  | Open, global | 7005161778000000000♠161,778[176] | 
| LaiBhaari | Marathi social networking | 000000002010-01-01-00002010 | 7005250000000000000♠250,000 | Open | 7005952782000000000♠952,782[177] | 
| Last.fm | Music | 000000002002-01-01-00002002 | 7007300000000000000♠30,000,000[178] | Open | 7002772000000000000♠772[179] | 
| Late Night Shots | Message boards, member profile pages, spotting other members | 000000002006-01-01-00002006 | 7004200000000000000♠20,000 (2008)[180] | Invite-only | 228888[181] | 
| LibraryThing | Book lovers | 000000002005-08-29-000029 August 2005 | 7006130000000000000♠1,300,000[182] | Open to people 13 and older | 7004108000000000000♠10,800[183] | 
| Lifeknot | Shared interests, hobbies |  |  | Open to people 18 and older | 7006107168600000000♠1,071,686[184] | 
| LinkedIn | Business and professional networking | 000000002003-05-01-0000May 2003 | 7008200000000000000♠200,000,000[185] | Open to people 18 and older | 7001120000000000000♠12[186] | 
| LinkExpats | Social networking website for expatriates. 100+ countries. |  |  | Open, global | 7005800451000000000♠800,451[187] | 
| Listography | Lists. Autobiography |  |  | Open | 7004925250000000000♠92,525[188] | 
| LiveJournal | Blogging. Popular in Russia and among the Russian-speaking diaspora abroad. | 000000001999-04-15-000015 April 1999 | 7007175649770000000♠17,564,977[189] | Open (OpenID) | 7002115000000000000♠115[190] | 
| Livemocha | Online language learning |  | 7006500000000000000♠5,000,000[191] | Open | 7003410000000000000♠4,100[192] | 
| Makeoutclub | General | 000000001999-08-09-00009 August 1999 |  | Open | 7005756300000000000♠756,300[193] | 
| MEETin | General |  |  | Open | 7005318979000000000♠318,979[194] | 
| Meetup (website) | General. Used to plan offline meetings for people interested in various activities |  |  | Open to people 18 and older | 7002481000000000000♠481[195] | 
| Meettheboss | Business and finance community, worldwide. |  |  | Open | 7005315513000000000♠315,513[196] | 
| MillatFacebook | General, created in response to Facebook [197] | 000000002010-05-01-0000May 2010 | 7005461200000000000♠461,200[198] | Open | 7005236663000000000♠236,663[199] | 
| mixi | Japan | 000000002000-10-25-000025 October 2000 | 7007243231600000000♠24,323,160[200] | Open | 7002232000000000000♠232[201] | 
| MocoSpace | Mobile community, worldwide | 000000002005-01-01-00002005 | 7006300000000000000♠3,000,000[202] | Open to people 14 and older | 7003988200000000000♠9,882[203] | 
| MOG | Music |  |  | Open to people 14 and older | 7004139550000000000♠13,955[204] | 
| MouthShut.com | Social network, social media, consumer reviews |  |  | Open | 7003334000000000000♠3,340[205] | 
| Mubi | Auteur cinema |  | 7005200000000000000♠200,000 | Open | 7004182250000000000♠18,225[206] | 
| MyHeritage | Family-oriented social network service |  | 7007300000000000000♠30,000,000 [207] | Open | 7003375600000000000♠3,756[208] | 
| MyLife | Locating friends and family, keeping in touch (formerly Reunion.com) |  | 7007510000000000000♠51,000,000[209] | Open | 7003176500000000000♠1,765[210] | 
| My Opera | Blogging, mobile blogging, photo sharing, connecting with friends, Opera Link and Opera Unite. Global |  | 7006730000000000000♠7,300,000[211] | Closed | NA[n 3] | 
| Myspace | General | 000000002003-08-01-0000August 2003 | 7007300000000000000♠30,000,000+[212][213] | Open to ages 13 and older. | 7002161000000000000♠161[214] | 
| Nasza-klasa.pl | School, college and friends. Popular in Poland |  | 7007110000000000000♠11,000,000[215] | Open | 7004751450000000000♠75,145[216] | 
| Netlog | General. Popular in Europe, Turkey, the Arab world and Canada's Québec province. Formerly known as Facebox and Redbox.[217] |  | 7007950000000000000♠95,000,000[218] | Open to people 13 and older | 7002545000000000000♠545[219] | 
| Nexopia | Canada |  | 7006140000000000000♠1,400,000[220] | Open to people 13 and older [221] | 7004252410000000000♠25,241[222] | 
| NGO Post | Non-profit news sharing and networking, mainly in India |  | 7004150000000000000♠15,000[223] | Open | 7004420760000000000♠42,076[224] | 
| Ning | Users create their own social websites and social networks | 000000002005-01-01-00002005 (Networks 2007) |  | Open to people 13 and older | 7002378000000000000♠378[225] | 
| Odnoklassniki | Connect with old classmates. Popular in Russia and former Soviet republics |  | 7007450000000000000♠45,000,000[226] | Open | 7001650000000000000♠65[227] | 
| Open Diary | First online blogging community, founded in 1998 | 000000001998-01-01-00001998 | 7006500000000000000♠5,000,000[228] | Open to people 13 and older | 7004281340000000000♠28,134[229] | 
| Orkut | General. Owned by Google Inc. Popular in India and Brazil.[230] | 000000002004-01-22-000022 January 2004 | 7008100000000000000♠100,000,000[231] | Closed | 7002319000000000000♠319[232] | 
| OUTeverywhere | Gay/LGBTQ community |  |  | Open | 7005445440000000000♠445,440[233] | 
| PatientsLikeMe | Online community for patients with life-changing illnesses to find other patients like them, share their data with others, and learn more about their condition to improve their outcome. | 000000002006-01-01-00002006 | 7005109587000000000♠109,587[234] | Open to people 13 years and up | 7004695140000000000♠69,514[235] | 
| Partyflock | Dutch virtual community for people interested in house music and other electronic dance music. | 000000002001-11-10-000010 November 2001 | 7005321125000000000♠321,125 | Open to people 18 years and up | 7004168280000000000♠16,828[236] | 
| Pingsta | Collaborative platform for the world's internetwork experts |  |  | Invite-only, only Internet experts | 7006253364000000000♠2,533,640[237] | 
| Pinterest | Online pinboard for organizing and sharing things you love | 000000002011-01-01-00002011 |  | Open | 7001380000000000000♠38[238] | 
| Plaxo | Aggregator |  | 7007500000000000000♠50,000,000[239] | Open | 7003531000000000000♠5,310[240] | 
| Playfire | Computer and video games |  |  | Open to people 13 and older | 7004382590000000000♠38,259[241] | 
| Playlist.com | General, music |  |  | Open to people over 13 | 7003802600000000000♠8,026[242] | 
| Plurk | Micro-blogging, RSS, updates. Very popular in Taiwan |  |  | Open | 7003199100000000000♠1,991[243] | 
| Poolwo | Social networking site from India | 000000002014-01-07-00007 January 2014 | 7004123500000000000♠12,350[244] | Open | 7005764227000000000♠764,227[245] | 
| Qapacity | A business-oriented social networking site and a business directory |  |  | Closed | 7004206400000000000♠20,640[246] | 
| Quechup | General, friendship, dating | 000000002007-01-01-00002007 |  | Open to those over 16 | 7004829140000000000♠82,914[247] | 
| Qzone | General. In Simplified Chinese; caters for mainland China users |  | 7008480000000000000♠480,000,000[248][249] | Open to the general public | NA[n 3] | 
| Raptr | Video games |  |  | Open | 7004256640000000000♠25,664[250] | 
| Ravelry | Knitting and crochet |  | 7006300000000000000♠3,000,000[251] | Open | 7003233400000000000♠2,334[252] | 
| Renren | Significant site in China. Was known as 校内 (Xiaonei) until August 2009. |  | 7008160000000000000♠160,000,000[253] | Open | 7001950000000000000♠95[254] | 
| ReverbNation.com | Social network for musician and bands |  | 7005500000000000000♠500,000[255] | Open to people 16 and older | 7003180600000000000♠1,806[256] | 
| Ryze | Business |  | 7005500000000000000♠500,000[257] | Closed | 7004713240000000000♠71,324[258] | 
| ScienceStage | Science-oriented multimedia platform and network for scientists |  |  | Open | 7004616680000000000♠61,668[259] | 
| Sgrouples | General, with focus on privacy rights | 000000002012-05-16-000016 May 2012 |  | Open | 7005258091000000000♠258,091[260] | 
| ShareTheMusic | Music community. Sharing and listening to music for free and legally |  |  | Open | 7005612429000000000♠612,429[261] | 
| Shelfari | Books | 000000002006-10-11-000011 October 2006 |  | Open | 7004181520000000000♠18,152[262] | 
| Sina Weibo | Social microblogging site in mainland China. | 000000002009-08-14-000014 August 2009 | 7008300000000000000♠300,000,000[263] | Open | 7001280000000000000♠28[264] | 
| Skoob | Collaborative social network for Brazilian readers | 000000002009-01-01-00002009 | 7005420000000000000♠420,000[265] | Open | 7004284490000000000♠28,449[266] | 
| Skyrock | Social network in French-speaking world |  | 7007220000000000000♠22,000,000[267] | Open | 7002710000000000000♠710[268] | 
| Smartican | Open social networking portal | 000000002013-01-31-000031 January 2013 | 7005260000000000000♠260,000[269] | Open | 7004264580000000000♠26,458[270] | 
| SocialVibe | Social network for charity |  | 7005435000000000000♠435,000 | Open | 7005101364000000000♠101,364[271] | 
| Sonico.com | General. Popular in Latin America and Spanish and Portuguese speaking regions. |  | 7007500000000000000♠50,000,000[272][273] | Open to people 13 and older | 7003267600000000000♠2,676[274] | 
| SoundCloud | Repository of original music pieces and networking. |  | 7007100000000000000♠10,000,000[275] | Open | 7002299000000000000♠299[276] | 
| Spaces | Russian social network targeted to mobile phone users |  |  | Open | 7003995300000000000♠9,953[277] | 
| Spot.IM | A service for webmasters to add social networking functionality to their websites | 000000002012-01-01-00002012 | 7005250000000000000♠250,000[278] | Open | 7004680160000000000♠68,016[279] | 
| Spring.me | Social network for meeting people | 000000002013-09-01-0000September 2013 |  | Open to people 13 and older | 7003496700000000000♠4,967[280] | 
| Stage 32 | US-based social network and educational site for creative professionals in film, television and theater | 000000002012-02-01-0000February 2012 | 7005175000000000000♠175,000 |  | 7004353820000000000♠35,382[281] | 
| Stickam | Live video streaming and chat. |  | 7006900000000000000♠9,000,000[282] | Closed | 7003920100000000000♠9,201[283] | 
| Streetlife | UK based. Links members according to where they live | 21 March 2011 | 1,000,000 [284] | Open | 18,757 [285] | 
| StudiVZ | University students, mostly in the German-speaking countries. School students and those out of education sign up via its partner sites schülerVZ and meinVZ. |  | 7007170000000000000♠17,000,000[286] | Open | 7003708000000000000♠7,080[287] | 
| Students Circle Network | A social network connecting students, teachers and institutions to course resources, study groups and learning spaces. | 000000002010-12-01-0000December 2010 |  | Open | 7005345110000000000♠345,110[288] | 
| StumbleUpon | Stumble through websites that match users' selected interests |  | 7007200000000000000♠20,000,000[289] | Open | 7002146000000000000♠146[290] | 
| Tagged | General. | 000000002004-10-01-0000October 2004 | 7008100000000000000♠100,000,000[291] | Open | 7002288000000000000♠288[292] | 
| Talkbiznow | Business networking |  |  | Open | 7005136346000000000♠136,346[293] | 
| Taltopia | Online artistic community |  |  | Open | 7005281501000000000♠281,501[294] | 
| Taringa! | General (primarily Argentina) |  | 7007110000000000000♠11,000,000[295] | Open to people 13 and older | 7002214000000000000♠214[296] | 
| TeachStreet | Education / learning / teaching - more than 400 subjects |  |  | Open | 7005422704000000000♠422,704[297] | 
| TermWiki | Learning / languages / translation - 1.2 million terms in more than 1300 subjects | 000000002010-05-01-0000May 2010 |  | Open | 7004229970000000000♠22,997[298] | 
| The Sphere | A private online social luxury network with exclusive personalized services | 000000002008-12-01-0000December 2008 | 7003130000000000000♠1,300[299] | Invite-only | 7006111530500000000♠1,115,305[300] | 
| TravBuddy.com | Travel | 000000002005-01-01-00002005 | 7006158800000000000♠1,588,000[301] | Open to people 18 and older | 7004215230000000000♠21,523[302] | 
| Travellerspoint | Travel | 000000002002-01-01-00002002 | 7005310000000000000♠310,000[303] | Open | 7004152750000000000♠15,275[304] | 
| Tsu | General | 000000002008-01-01-00002008 |  | Open | 7003523000000000000♠5,230[305] | 
| tribe.net | General |  |  | Open | 7003808100000000000♠8,081[306] | 
| Trombi.com | French subsidiary of Classmates.com |  | 7006440000000000000♠4,400,000[307] |  | 7004162270000000000♠16,227[308] | 
| Tuenti | Spanish-based university and high school social network. |  | 7007120000000000000♠12,000,000[309] | Open | 7004164840000000000♠16,484[310] | 
| Tumblr | Microblogging platform and social networking website. | 000000002007-02-01-0000February 2007 | 7008226950000000000♠226,950,000[311] | Open | 7001410000000000000♠41[312] | 
|
| Twitter | General. Micro-blogging, RSS, updates | 000000002006-07-15-000015 July 2006 | 7008645750000000000♠645,750,000[313] | Open to all ages [314] | 7000800000000000000♠8[315] | 
| Tylted | Mobile social game network[316] | 000000002007-01-01-00002007 | 7006300000000000000♠3,000,000[317] | Open to people 14 and older | 7005737508000000000♠737,508[318] | 
| Uplike | General | 000000002011-01-01-00002011 | 7006105003900000000♠1,050,039[319] | Open | 7002288000000000000♠288[320] | 
|
| VK | General, including music upload, listening and search. Popular in Russia and former Soviet republics. | 000000002006-09-01-0000September 2006 | 7008249409900000000♠249,409,900[321] | Open | 7001380000000000000♠38[322] | 
| Vampirefreaks.com | Gothic and industrial subculture | 000000001999-01-01-00001999 | 7006193104900000000♠1,931,049[323] | Open to users 13 and over | 7004210520000000000♠21,052[324] | 
| Viadeo | Global social networking and campus networking available in English, French, German, Spanish, Italian and Portuguese |  | 7007350000000000000♠35,000,000[325] | Open | 7002435000000000000♠435[326] | 
 
| Virb | Social network that focuses heavily on artists, including musicians and photographers | 000000002007-01-01-00002007 |  | Open | 7004333710000000000♠33,371[327] | 
| Vox | Blogging |  |  | Open | 7004565580000000000♠56,558[328] | 
| Wattpad | For readers and authors to interact and e-book sharing |  |  | Open | 7003703600000000000♠7,036[329] | 
| WAYN | Travel and lifestyle | 000000002003-05-01-0000May 2003 | 7007100000000000000♠10,000,000[330] | Open to people 18 and older | 7003136700000000000♠1,367[331] | 
| WeeWorld | Teenagers - 9 to 17 |  | 7007300000000000000♠30,000,000[332] | Open to ages 10 and older. | 7004183170000000000♠18,317[333] | 
| We Heart It | Image-based social network focused on inspiration, expression and creativity | 000000002008-01-01-00002008 | 7007200000000000000♠20,000,000[334] | Open | 7002899000000000000♠899[335] | 
| Wellwer | Community without borders, where sharing is everything. | 000000002011-09-01-0000September 2011 |  | Open to people 13 years and older | 7005370755000000000♠370,755[336] | 
| Wepolls.com | Social polling network |  |  | Open | 7006120437600000000♠1,204,376[337] | 
| Wer-kennt-wen | General |  |  | General | 7003214700000000000♠2,147[338] | 
| weRead | Books | 000000002007-06-01-0000June 2007 | 7006400000000000000♠4,000,000 | Open | 7005305720000000000♠305,720[339] | 
| Wiser.org | Online community space for the social justice and environmental movement[340] | 000000002007-04-01-0000April 2007 | 7004716000000000000♠71,600[341] | Open to people 16 and older | 7005239901000000000♠239,901[342] | 
| Wooxie | Blogging and micro-blogging |  |  | Open | 7005111538000000000♠111,538[343] | 
| WriteAPrisoner.com | Site networking inmates, friends, family | 000000002000-09-01-0000September 2000 | 7004660000000000000♠66,000[344] | Open to people 18 years and older | 7005228915000000000♠228,915[345] | 
| Xanga | Blogs and "metro" areas | 000000001998-01-01-00001998 | 7007270000000000000♠27,000,000[346] | Open | 7003394300000000000♠3,943[347] | 
| XING | Business (primarily Europe (Germany, Austria, Switzerland)) |  | 7007111000000000000♠11,100,000[348] | Open | 7002270000000000000♠270[349] | 
| Xt3 | Catholic social networking, created for World Youth Day 2008 |  |  | Open | 7005712292000000000♠712,292[350] | 
| Yammer | Social networking for office colleagues | 000000002008-01-01-00002008 |  | Must have company email | 7003362200000000000♠3,622[351] | 
| Yelp, Inc. | Local business review and talk |  |  | Open | 7002186000000000000♠186[352] | 
| Yookos | General: photos, videos, blogs, games. |  |  | Open | 7004534980000000000♠53,498[353] | 
| Zoo.gr | Greek web meeting point | 000000002004-01-01-00002004 | 7005890000000000000♠890,000[354] | Open | 7004345770000000000♠34,577[355] | 
| Zooppa | Online community for creative talent (host of brand sponsored advertising contests) |  | 7004600000000000000♠60,000[356] | Open to people 14 and older[357] | 7004363730000000000♠36,373[358] |