Name Description or focus Date launched Registered users Registration Global Alexa [ 1] page ranking Avaaz Global community and political activism 2007 69,000,000 Open N/A BlackPlanet Black Americans 1999 20,000,000 [ 2] Open 7,193 [ 3] Blind Employees 2013 2,000,000 [ 4] Open with verified work email 43,680 [ 5] Bluesky Microblogging 2024 32,000,000 [ 6] Open to people 13 and older N/A Busuu Language learning community (headquartered in Madrid, Spain) 2008 12,000,000 [ citation needed ] Open 8,049 [ 7] Buzznet Music and pop-culture 2005 10,000,000 [ 8] Open 6,955 [ 9] CafeMom Mothers 2006 1,250,000 [ 10] Open to moms and moms-to-be 1,293 [ 11] Care2 Green living, social activism, animal rights 1998 9,961,947 [ 12] Open 1,930 [ 13] CaringBridge Not for profit providing free websites that connect family and friends during a serious health event, care and recovery. [ 14] 1997 9,500,000 [ 15] Open to people 18 and older [ 16] 4,279 [ 17] Classmates.com School, college, work and the military 1995 50,000,000 [ 18] Open to people 18 and older [ 19] 3,284 [ 20] CouchSurfing Worldwide network for making connections between travelers and the communities they visit 2003 18,000,000 [ 21] Open 2,231 [ 22] Cyworld General, popular in South Korea 1999 24,000,000 [ 23] Open 1,616 [ 24] delicious Social bookmarking allowing users to locate and save websites that match their own interests 2003 8,822,921 [ 25] Open 436 [ 26] DeviantArt Art community 2000 22,000,000 [ 27] Open to people 13 and older 131 [ 28] Duolingo Language learning community and forums [ 29] 2011 [ citation needed ] 500,000,000 [ 30] Open to all ages. Forums open to people 13 and older [ 31] 547 [ 32] Draugiem.lv General (primarily Latvia, Lithuania, and Hungary) 2004 2,600,466 [ 33] Invitation only 2,698 [ 34] Douban Chinese Web 2.0 website providing user review and recommendation services for movies, books, and music 2005 46,850,000 [ 35] Open 106 [ 36] DXY.cn Chinese online community for physicians, health care professionals, pharmacies and facilities 2000 [ citation needed ] 2,000,000 [ 37] Open 8,367 [ 38] Edmodo Social learning network for schools 2008 50,000,000 + [ 39] Open to students, teachers and parents 2,367 [ 40] English, baby! Students and teachers of English as a second language 2000 1,600,000 [ 41] Open 29,585 [ 42] Facebook General 2004 2.8×10 ^ 9 [ 43] Open to people 13 and older 3 [ 44] Fetlife People who are into BDSM 2008 1,200,000 [ 45] Open to people "of legal age to see adult content" 4,131 [ 46] Fishbrain Mobile social network, fishing 2010 2,200,000 [ 47] Open 436,164 [ 48] Flixster Movies 2007 63,000,000 [ 49] Open to people 13 and older 4,012 [ 50] Flickr Photo sharing, commenting, photography related networking, worldwide 2004 114,000,000 [ 51] Open 48 [ 52] Fotki Photo sharing, video hosting, photo contests, journals, forums, flexible privacy protection, friend's feed, audio comments and unlimited custom design integration 1998 1,632,565 Open 8,011 [ 53] Fotolog Photoblogging, popular in South America and Spain 2002 20,000,000 [ 54] Open 3,168 [ 55] Foursquare Location-based mobile social network 2009 20,000,000 [ 56] Open 817 [ 57] Friendster General, popular in Southeast Asia and formerly in the western world 2002 90,000,000 [ 58] Open to people 16 and older 12,167 [ 59] Gaia Online Anime and games, popular in the US, Canada and Europe, and moderately popular in Asia 2003 23,523,663 [ 60] Open to people 13 and older 6,277 [ 61] Geni.com Families, genealogy 2007 15,000,000 [ 62] Open 5,958 [ 63] GetGlue Social network for entertainment 2008 2,000,000 [ 64] Open 3,735 [ 65] Goodreads Library cataloging, book lovers 2006 90,000,000 [ 66] Open 327 [ 67] GrabCAD GrabCAD Community is the largest online CAD library, design and 3D printing tutorials, and a network of additive professionals 2009 11,000,000 [ 68] Open N/A Habbo General for teens. Over 31 communities worldwide. Chat room and user profiles. 2000 268,000,000 [ 69] [ 70] [ 71] Open to people 13 and older 15,255 [ 72] HER Sapphic community app for queer women, non-binary and trans people. Community groups, online events and IRL events. 114 countries. 15 million users. 2015 15,000,000 [ 73] Open to people 18 and over 1,230 hi5 General, popular in Nepal , Mongolia , Thailand , Romania , Jamaica , Central Africa , Portugal and Latin America 2003 80,000,000 [ 74] Open to people 13 and older 902 [ 75] Hyves General, mostly popular in the Netherlands . 2004 10,097,000 [ 76] Open 2,243 [ 77] Instagram General 2010 2×10 ^ 9 [ 78] Open 38 [ citation needed ] Itsmy Mobile community worldwide, blogging, friends, personal TV-shows 2008 2,500,000 [ 79] 770,100 [ 80] iWiW Hungary 2002 4,000,000 [ 81] Invite-only 3,831 [ 82] Jiepang Location-based mobile social network, in the Chinese language 2010 3,000,000 [ 83] Open 14,790 [ 84] Kiwibox General 1999 2,400,000 [ 85] Open to people 13 and older 104,563 [ 86] Kobo Reading platform and social network 2009 14,500,000 [ 87] Open 7,277 [ 88] Koofers Social studying network for college students 2008 1,000,000 [ 89] Open 97,090 [ 90] Last.fm Music 2002 30,000,000 [ 91] Open 772 [ 92] LibraryThing Book lovers 2005 1,300,000 [ 93] Open to people 13 and older 10,800 [ 94] LinguaLeo Online English language learning website, popular among the Russian-speaking diaspora 2010 3,749,061 [ 95] Open 7,480 [ 96] LinkedIn Business and professional networking 2003 774,000,000 [ 97] Open to people 18 and older 12 [ 98] LiveJournal Blogging, popular in Russia and among the Russian-speaking diaspora abroad 1999 17,564,977 [ 99] Open (OpenID ) 115 [ 100] Livemocha Online language learning 2007 5,000,000 [ 101] Open 4,100 [ 102] Mastodon An open-source, self-hosted and globally interconnected microblogging community 2016 8,700,000 [ 103] Open, depends on the instance NA mixi Japan 2000 24,323,160 [ 104] Open 232 [ 105] Miiverse Social Network for Nintendo's Wii U home console and 3DS handheld family where users can post about games and ask for help on a particular game 2012 4,500,000 Nintendo Network members only NA MocoSpace Mobile community, worldwide 2005 3,000,000 [ 106] Open to people 14 and older 9,882 [ 107] MyHeritage Family-oriented social network service 2003 30,000,000 [ 108] Open 3,756 [ 109] MyLife Locating friends and family, keeping in touch (formerly Reunion.com ) 2002 51,000,000 [ 110] Open 1,765 [ 111] Myspace General 2003 30,000,000 + [ 112] [ 113] Open to ages 13 and older 161 [ 114] Nasza-klasa.pl School, college and friends, popular in Poland 2006 11,000,000 [ 115] Open 75,145 [ 116] Netlog General, popular in Europe, Turkey, the Arab world and Québec, Canada . Formerly known as Facebox, Bingbox and Redbox. [ 117] 1999 95,000,000 [ 118] Open to people 13 and older 2,621 [ 119] Nexopia Canada 2003 1,400,000 [ 120] Open to people 13 and older [ 121] 25,241 [ 122] Odnoklassniki Connecting with old classmates, popular in Russia and former Soviet republics 2006 45,000,000 [ 123] Open 65 [ 124] Open Diary First online blogging community, founded in 1998 1998 5,000,000 [ 125] Open to people 13 and older 28,134 [ 126] Plaxo Aggregator 2002 50,000,000 [ 127] Open 5,310 [ 128] Ravelry Knitting and crochet 2007 6,700,000 [ 129] Open 5,189 [ 130] Reddit Social news , link sharing and commenting 2005 73,000,000 [ 131] Open 8 [ 132] Sina Weibo Social microblogging site in China 2009 300,000,000 [ 133] Open 28 [ 134] Sonico.com General, popular in Latin America and Spanish and Portuguese speaking regions 2007 50,000,000 [ 135] [ 136] Open to people 13 and older 2,676 [ 137] SoundCloud Repository of original music pieces and networking 2008 10,000,000 [ 138] Open 299 [ 139] Stack Overflow Question and answer knowledge market site for programmers 2008 16,000,000 [ 140] Open to people 13 and older 41 [ 141] Steemit Blockchain-based social networking 2016 1,300,000 [ 142] Open 5,577 [ 143] StudiVZ University students, mostly in German-speaking countries. School students and those out of education sign up via its partner sites SchülerVZ and MeinVZ . 2005 17,000,000 [ 144] N/A Tagged General 2004 100,000,000 [ 145] Open 288 [ 146] Taringa! General (primarily Argentina ) 2004 11,000,000 [ 147] Open to people 13 and older 214 [ 148] TravBuddy.com Travel 2005 1,588,000 [ 149] Open to people 18 and older 21,523 [ 150] Twitter General, microblogging, RSS, updates 2006 330,000,000 [ 151] Open to all ages [ 152] 12 [ 153] Tylted Mobile social game network [ 154] 2007 3,000,000 [ 155] Open to people 14 and older 737,508 [ 156] Vkontakte General, including music upload, listening and search. Popular in Russia and former Soviet republics. 2006 208,833,674 [ 157] Open 38 [ 158] Vampirefreaks.com Gothic and industrial subculture 1999 1,931,049 [ 159] Open to users 13 and over 21,052 [ 160] Viadeo Global social and campus networking available in English, French, German, Spanish, Italian and Portuguese 2004 35,000,000 [ 161] Open/lift 435 [ 162] WAYN Travel and lifestyle 2003 10,000,000 [ 71] Open to people 18 and older 1,367 [ 163] WeeWorld Teenagers – 10 to 17 2000 30,000,000 [ 164] Open to ages 13 and older 18,317 [ 165] Xanga Blogs and "metro" areas 1999 27,000,000 [ 166] Open 3,943 [ 167] XING Business (primarily Europe, specifically Germany, Austria, and Switzerland) 2003 11,100,000 [ 168] Open 270 [ 169]