A continuación cito las redes sociales más importantes a nivel mundial, ordenadas por número de usuarios, no están todas pero casi. Impresionante recopilación, para ver información actualizada y ampliada visitar el enlace en wikipedia: http://en.wikipedia.org/wiki/List_of_social_networking_websites
| Description/Focus | Registered users |
| General. | |
| Windows Live Spaces | Blogging (formerly MSN Spaces) |
| MySpace | General. Had lost some popularity in 2007 and 2008, but has started to experience a slight renaissance lately. |
| Qzone | General. In Simplified Chinese; caters for mainland China users |
| General. Micro-blogging, RSS, updates | |
| Flickr | Photo sharing, commenting, photography related networking, worldwide |
| General but mainly business | |
| hi5 | General. Popular in India,Portugal, Mongolia, Thailand, Romania, Jamaica, Central Africa and Latin America. Not popular in the USA. |
| Kaixin001 | General. In Simplified Chinese; caters for mainland China users |
| LiveJournal | Blogging |
| Mixi | Japan |
| Odnoklassniki | General. Popular in Russia and former Soviet republics |
| deviantART | Art community |
| Renren | Significant site in China. Was known as 校内 (Xiaonei) until August 2009. |
| Orkut | Owned by Google. Popular in Brazil and India.[188] |
| Nasza-klasa.pl | School, college and friends. Popular in Poland. |
| Skyrock | Social Network in French-speaking world |
| Tagged | General. Subject to quite some controversy about its e-mail marketing and privacy policy. |
| Taringa! | General. |
| Netlog | General. Popular in Europe, Turkey, the Arab World and Canada’s Québec province. Formerly known as Facebox and Redbox.[171] |
| Ning | Users create their own social websites and social networks |
| Friendster | General. Popular in Southeast Asia. No longer popular in the western world. |
| Badoo | General, Popular in Europe |
| Vkontakte | Russian social network. |
| 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. |
| Hyves | General, Most popular in the Netherlands. |
| Fotolog | Photoblogging. Popular in South America and Spain. |
| Tumblr | General. Micro-blogging, RSS |
| Multiply | “Real world” relationships. Popular in Asia. Not popular in the western world. |
| StumbleUpon | Stumble through websites that match your selected intrests. |
| Business (primarily Europe (Germany, Austria, Switzerland) and China) | |
| Tuenti | Spanish-based university and High School social network. Very Popular in Spain |
| Last.fm | Music |
| Bebo | General. |
| Yelp, Inc. | Local Business Review and Talk |
| imeem | Music, Video, Photos, Blogs |
| Sonico.com | General. Popular in Latin America and Spanish and Portuguese speaking regions. |
| iWiW | Hungary |
| My Opera | Blogging, mobile blogging, sharing photos, connecting with friends. Global. |
| Ibibo | Talent based social networking site that allows to promote one’s self and also discover new talent. Most popular in India. |
| Cloob | General. Popular in Iran. |
| Buzznet | Music and pop-culture |
| Meetup.com | General. Used to plan offline meetings for people interested in various activities. |
| Xanga | Blogs and “metro” areas |
| Classmates.com | School, college, work and the military |
| myYearbook | General |
| Flixster | Movies |
| Gaia Online | Anime and games |
| Plurk | Micro-blogging, RSS, updates. Very popular in Taiwan. |
| OkCupid | Social networking and dating |
| Vox | Blogging |
| MyLife | Locating friends and family, keeping in touch (formerly Reunion.com) |
| Plaxo | Aggregator |
| Viadeo | European Social Networking and Campus Networking in Seven Languages |
| Draugiem.lv | General (primarily LV, LT, HU) |
| BlackPlanet | African-Americans |
| Goodreads | Library cataloging, book lovers |
| MouthShut.com | Social Network, social media, consumer reviews |
| Care2 | Green living and social activism |
| Nettby | Norwegian Community. |
| Stickam | Live video streaming and chat. |
| MyHeritage | family-oriented social network service |
| Grono.net | Poland |
| WAYN | Travel and lifestyle |
| Bigadda | Indian Social Networking Site. |
| IRC-Galleria | Finland |
| Experience Project | Life experiences |
| MocoSpace | mobile community, worldwide |
| CouchSurfing | Worldwide network for making connections between travelers and the local communities they visit. |
| FilmAffinity | Movies and TV Series |
| Gather.com | Article, picture, and video sharing, as well as group discussions |
| Livemocha | Online language learning – dynamic online courses in 22 languages – world’s largest community of native language speakers. |
| MOG | Music |
| CafeMom | Mothers |
| LibraryThing | Book lovers |
| Foursquare | Location based mobile social network |
| DailyBooth | Photo-blogging site where users upload a photo every day |
| tribe.net | General |
| Geni.com | Families, genealogy |
| MyAnimeList | Anime themed social community |
| ReverbNation.com | Social network for musician and bands |
| Habbo | General for teens. Over 31 communities worldwide. Chat Room and user profiles. |
| Trombi.com | French subsidiary of Classmates.com |
| Vampirefreaks.com | Gothic and industrial subculture |
| Ravelry | Knitting and crochet |
| Fetlife | People who are into BDSM |
| Zoo.gr | Greek Web Meeting point |
| aSmallWorld | European jet set and social elite |
| Wakoopa | For computer fans that want to discover new software and games. |
| Fubar | dating, an “online bar” for 18 and older |
| Friends Reunited | UK based. School, college, work, sport and streets |
| ANobii | Books |
| TravBuddy.com | Travel |
| Travellerspoint | Travel |
| italki.com | Language learning social network. 100+ languages. |
| Jaiku | General. Owned by Google. |
| Elftown | Community and wiki around Fantasy and sci-fi. |
| DontStayIn | Clubbing (primarily UK) |
| Shelfari | Books |
| Ryze | Business |
| TalentTrove | Online Talent Network |
| DailyStrength | Medical & emotional support community – Physical health, Mental health, Support groups |
| GamerDNA | Computer and video games |
| Nexopia | Canada |
| Amie Street | Music |
| InterNations | International community |
| Eons.com | For baby boomers |
| Biip | Norwegian Community. |
| Faceparty | General. Popular UK. |
| PartnerUp | Social networking site for entrepreneurs and small business owners |
| Yammer | Social networking for office colleagues |
| BigTent | organization and communication portal for groups |
| Hospitality Club | Hospitality |
| ScienceStage | Science-oriented multimedia platform and network for scientists |
| Open Diary | First online blogging community, founded in 1998. |
| SocialVibe | Social Network for Charity |
| Blogster | Blogging service that lets users “add friends” or establish business connections to their profiles. |
| ResearchGATE | Social network for scientific researchers |
| Taltopia | Online artistic community |
| Muxlim | Muslim portal site |
| Playahead | Swedish, Danish,Norwegian teenagers |
| LunarStorm | Sweden |
| NGO Post | Non-Profit news sharing and networking, mainly in India |
| Athlinks | Running, Swimming |
| Gays.com | Social network for LGBT community, Guide for LGBT bars, restaurants, clubs, shopping |
| WiserEarth | Online community space for the social justice and environmental movement[260] |
| quarterlife | A social network for artists, filmmakers, musicians, and creative people |
| MyChurch | Christian Churches |
| Wasabi | General |
| Qapacity | A a business-oriented social networking site and a business directory |
| Kiwibox | General. For the users, by the users, a social network that is more than a community. |
| Meettheboss | Business and Finance community, worldwide. |
| Disaboom | People with disabilities. (Amputee, cerebral palsy, MS, and other disabilities.) |
| Gogoyoko | Fair play in Music – Social networking site for musicians and music lovers |
| Faces.com | British teens |
| Advogato | Free and open source software developers |
| MyLOL | General. Popular in the United States, Europe and Australia. |
| Decayenne | European and American social elite |
| MEETin | General |
| Broadcaster.com | Video sharing and webcam chat |
| Listography | Lists. Autobiography. |
| Itsmy | Mobile community worldwide, blogging, friends, personal TV-shows |
| Exploroo | Travel Social Networking. |
| Talkbiznow | Business networking |
| Epernicus | For research scientists |
| Avatars United | Online games. |
| OneClimate | Not for Profit Social networking and Climate Change |
| Passportstamp | Travel |
| kaioo | General, nonprofit |
| Playboy U | Online college community |
| Xt3 | Catholic social networking, created after World Youth Day 2008 |
| ShareTheMusic | Music Community. Sharing and listening to music for free and legally. |
| Cake Financial | Investing |
| CollegeBlender | A social media-based online community for college students, faculty, and alumni. |
| Dol2day | Politic community, Social network, Internet radio (German-speaking countries) |
| lifeknot | Shared interests, hobbies |
| WeOurFamily | General with emphasis on privacy and security |
| WebBiographies | Genealogy and biography |
| Soundpedia | Music |
| JammerDirect.com | Creative resource website |
| Youmeo | UK Social Network (focus on data portability) |
| College Tonight | College students. |
| Scispace.net | Collaborative network site for scientists |
| Gossipreport.com | Anonymous gossip |
| Frühstückstreff | General |
| Fillos de Galicia | Galicia and Galician diaspora |
| Pingsta | Collaborative platform for the world’s Internetwork Experts |
| FledgeWing | Entrepreneural community targeted towards worldwide university students. |
| mobikade | mobile community, UK only |
| Present.ly | Enterprise social networking and micro-blogging |
| OneWorldTV | Not for Profit Video sharing and social networking aimed at people interested in social issues, development, environment, etc. |



super ilustrativo el recuadro.
bueno, muy bueno.
gracias
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