Companies often use these huge sites social sites (with 100 million or more active users)
But juicy plums of people may be achieved by participating in lesser known or specialty sites as well.
The top sites
Who User count
The rest
Name & Link Purpose
| 43 Things | Goal setting and achievement |
| Academia.edu | Social networking site for academics/researchers |
| Advogato | Free and open source software developers |
| aNobii | Books |
| AsianAvenue | A social network for the Asian American community |
| aSmallWorld | European jet set and social elite world-wide |
| Athlinks | Running, Swimming |
| Audimated.com | Independent music |
| Bebo | General |
| Biip.no | Norwegian community |
| BlackPlanet | Black Americans |
| Blauk | Anyone who wants to tell something about a stranger or acquaintance. |
| Blogster | Blogging community |
| Bolt.com | General |
| Busuu | Language learning community (headquartered in Madrid, Spain) |
| Buzznet | Music and pop-culture |
| CafeMom | Mothers |
| Care2 | Green living and social activism |
| CaringBridge | Not for profit providing free websites that connect family and friends during a serious health event, care and recovery.[33] |
| Classmates.com | School, college, work and the military |
| Cloob | General. Popular in Iran |
| CouchSurfing | Worldwide network for making connections between travelers and the communities they visit. |
| CozyCot | East Asian and Southeast Asian women |
| Cross.tv | Faith Based social network for Christian believers from around the world |
| Crunchyroll | Anime and forums. |
| Cyworld | General. Popular in South Korea. |
| DailyBooth | Photo-blogging site where users upload a photo every day |
| DailyStrength | Medical & emotional support community - Physical health, Mental health, Support groups |
| delicious | Social bookmarking allowing users to locate and save websites that match their own interests |
| deviantART | Art community |
| Diaspora* | Decentralized, privacy aware, general (open source) |
| didlr | Drawing service |
| Disaboom | People with disabilities (Amputee, cerebral palsy, MS, and other disabilities) |
| Dol2day | Politic community, Social network, Internet radio (German-speaking countries) |
| DontStayIn | Clubbing (primarily UK) |
| Draugiem.lv | General (primarily LV, LT, HU) |
| douban | Chinese Web 2.0 website providing user review and recommendation services for movies, books, and music. |
| DXY.cn | Chinese online community for physicians, health care professionals, pharmacies and facilities |
| Elftown | Community and wiki around Fantasy and sci-fi. |
| Elixio | Business executives jet set and global elite. |
| English, baby! | Students and teachers of English as a second language |
| Epernicus | For research scientists |
| Eons.com | For baby boomers and mature internet users age 40 and beyond. |
| eToro | Social Investing, Finance |
| Experience Project | Life experiences |
| Exploroo | Travel Social Networking. |
| General: Photos, Videos, Blogs, Apps. | |
| Faceparty | General. Popular UK. |
| Faces.com | Adult Social Network, Mainly UK & USA |
| Fetlife | People who are into BDSM |
| FilmAffinity | Movies and TV Series |
| Filmow | Movies and TV Series |
| FledgeWing | Entrepreneural community targeted towards worldwide university students |
| Flixster | Movies |
| Flickr | Photo sharing, commenting, photography related networking, worldwide |
| Focus.com | Business to Business, worldwide |
| Formspring | social Q&A website |
| Fotki | Photo sharing, video hosting, photo contests, journals, forums, flexible privacy protection, friend's feed, audio comments and unlimited custom design integration. |
| Fotolog | Photoblogging. Popular in South America and Spain |
| Foursquare | Location based mobile social network |
| Friendica | Distributed, federated, privacy aware, open source, general |
| Friends Reunited | UK based. School, college, work, sport and streets |
| Friendster | General. Popular in Southeast Asia. No longer popular in the western world |
| Frühstückstreff | General |
| Fuelmyblog | Blogging community |
| FullCircle | Geosocial networking and location-based services portal for mobile devices |
| Gaia Online | Anime and games. Popular in USA, Canada and Europe. Moderately popular around Asia. |
| GamerDNA | Computer and video games |
| Gapyear.com | Travel social network |
| Gather.com | Article, picture, and video sharing, as well as group discussions |
| Gays.com | Social network for LGBT community, Guide for LGBT bars, restaurants, clubs, shopping |
| Geni.com | Families, genealogy |
| GetGlue | Social network for entertainment |
| Gogoyoko | Fair play in Music - Social networking site for musicians and music lovers |
| Goodreads | Library cataloging, book lovers |
| Goodwizz | Social network with matchmaking and personality games to find new contacts. Global, based in France. |
| Google+ | General |
| GovLoop | For people in and around government |
| Grono.net | Poland |
| Habbo | General for teens. Over 31 communities worldwide. Chat room and user profiles. |
| hi5 | General. Popular in Nepal, Mongolia, Thailand, Romania, Jamaica, Central Africa, Portugal andLatin America. Not very popular in the USA. |
| Hospitality Club | Hospitality |
| Hotlist | Geo-Social Aggregator rooted in the concept of knowing where users' friends are, were, and will be. |
| HR.com | Social networking site for Human Resources professionals |
| Hub Culture | Global influencers focused on worth creation |
| Hyves | General, mostly popular in the Netherlands. |
| Ibibo | Talent based social networking site that allows to promote one's self and also discover new talent. Most popular in India. |
| Identi.ca | Twitter-like service popular with hackers and software freedom advocates. |
| Indaba Music | Online collaboration for musicians, remix contests, and networking. |
| A photo and video sharing site | |
| IRC-Galleria | Finland |
| italki.com | Language learning social network. 100+ languages. |
| Itsmy | Mobile community worldwide, blogging, friends, personal TV-shows |
| iWiW | Hungary |
| Jaiku | General. Microblogging. Owned by Google |
| Jiepang | Location based mobile social network. In Chinese language |
| Kaixin001 | General. In Simplified Chinese; caters for mainland China users |
| Kiwibox | General. |
| Lafango | Talent-Focused media sharing site |
| LaiBhaari | Marathi social networking |
| Last.fm | Music |
| LibraryThing | Book lovers |
| Lifeknot | Shared interests, hobbies |
| Business and professional networking | |
| LinkExpats | Social networking website for expatriates. 100+ countries. |
| Listography | Lists. Autobiography |
| LiveJournal | Blogging. Popular in Russia and among the Russian-speaking diaspora abroad. |
| Livemocha | Online language learning |
| Makeoutclub | General |
| MEETin | General |
| Meetup (website) | General. Used to plan offline meetings for people interested in various activities |
| Meettheboss | Business and Finance community, worldwide. |
| MillatFacebook | General, Created in Response to Facebook [192] |
| mixi | Japan |
| MocoSpace | mobile community, worldwide |
| MOG | Music |
| MouthShut.com | Social Network, social media, consumer reviews |
| Mubi | Auteur cinema |
| MyHeritage | family-oriented social network service |
| MyLife | Locating friends and family, keeping in touch (formerly Reunion.com) |
| My Opera | Blogging, mobile blogging, photo sharing, connecting with friends, Opera Link and Opera Unite. Global |
| Myspace | General |
| Nasza-klasa.pl | School, college and friends. Popular in Poland |
| Netlog | General. Popular in Europe, Turkey, the Arab World and Canada's Québec province. Formerly known as Facebox and Redbox.[212] |
| Nexopia | Canada |
| NGO Post | Non-Profit news sharing and networking, mainly in India |
| Ning | Users create their own social websites and social networks |
| Odnoklassniki | Connect with old classmates. Popular in Russia and former Soviet republics |
| Open Diary | First online blogging community, founded in 1998 |
| Orkut | General. Owned by Google Inc. Popular in India and Brazil.[225] |
| OUTeverywhere | Gay/LGBTQ Community |
| 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. |
| Partyflock | Dutch virtual community for people interested in house music and other electronic dance music |
| Pingsta | Collaborative platform for the world's InternetworkExperts |
| Online pinboard for organizing and sharing things you love | |
| Plaxo | Aggregator |
| Playfire | Computer and video games |
| Playlist.com | General, Music |
| Plurk | Micro-blogging, RSS, updates. Very popular in Taiwan |
| Poolwo | Social networking site from India |
| Qapacity | A a business-oriented social networking site and a business directory |
| Quechup | General, friendship, dating |
| Qzone | General. In Simplified Chinese; caters for mainland China users |
| Raptr | Video games |
| Ravelry | Knitting and crochet |
| Renren | Significant site in China. Was known as 校内 (Xiaonei) until August 2009. |
| ReverbNation.com | Social network for musician and bands |
| Ryze | Business |
| ScienceStage | Science-oriented multimedia platform and network for scientists |
| Sgrouples | General, with focus on privacy rights |
| ShareTheMusic | Music Community. Sharing and listening to music for free and legally |
| Shelfari | Books |
| Sina Weibo | Social microblogging site in Mainland China. |
| Skoob | Collaborative social network for Brazilian readers |
| Skyrock | Social Network in French-speaking world |
| SocialVibe | Social Network for Charity |
| Sonico.com | General. Popular in Latin America and Spanish and Portuguese speaking regions. |
| SoundCloud | Repository of original music pieces and networking. |
| Spaces | Russian Social Network targeted to mobile phone users |
| Stage 32 | US-based social network and educational site for creative professionals in film, television and theater |
| Stickam | Live video streaming and chat. |
| 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. |
| Students Circle Network | A Social Network connecting students, teachers and institutions to course resources, study groups and learning spaces. |
| StumbleUpon | Stumble through websites that match users' selected interests |
| Tagged | General. |
| Talkbiznow | Business networking |
| Taltopia | Online artistic community |
| Taringa! | General (primarily Argentina) |
| TeachStreet | Education / Learning / Teaching - More than 400 subjects |
| TermWiki | Learning / Languages / Translation - 1.2m terms in more than 1300 subjects |
| The Sphere | A Private Online Social Luxury Network with Exclusive Personalized Services |
| TravBuddy.com | Travel |
| Travellerspoint | Travel |
| tribe.net | General |
| Trombi.com | French subsidiary of Classmates.com |
| Tuenti | Spanish-based university and High School social network. |
| Tumblr | Microblogging platform and Social Networking Website. |
| General. Micro-blogging, RSS, updates | |
| Tylted | Mobile social game network[302] |
| Vkontakte | General, including music upload, listening and search. Popular in Russia and former Soviet republics. |
| Vampirefreaks.com | Gothic and industrial subculture |
| Viadeo | Global Social Networking and Campus Networking available in English, French, German, Spanish, Italian and Portuguese |
| Virb | Social network that focuses heavily on artists, including musicians and photographers |
| Vox | Blogging |
| Wattpad | For readers and authors to interact & e-book sharing |
| WAYN | Travel and lifestyle |
| WeeWorld | Teenagers - 10 to 17 |
| We Heart It | Image-based social network focused on inspiration, expression and creativity |
| Wellwer | Community without borders, where sharing is everything. |
| WeOurFamily | General with emphasis on privacy and security |
| Wepolls.com | Social polling network |
| Wer-kennt-wen | General |
| weRead | Books |
| Wiser.org | Online community space for the social justice and environmental movement[325] |
| Wooxie | Blogging and micro-blogging |
| WriteAPrisoner.com | Site networking inmates, friends, family |
| Xanga | Blogs and "metro" areas |
| Business (primarily Europe (Germany, Austria, Switzerland)) | |
| Xt3 | Catholic social networking, created for World Youth Day 2008 |
| Yammer | Social networking for office colleagues |
| Yelp, Inc. | Local Business Review and Talk |
| Zoo.gr | Greek Web Meeting point |
| Zooppa | Online Community for Creative Talent (host of brand sponsored advertising contests) |