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43 Things	Goal and Dreams; Tagging
Advogato	Free Software and Open Source developers
Amina - Chechen Republic Online	Chechens
aSmallWorld	European jet set and social elite
Bebo	Schools and colleges
BlackPlanet.com	African-Americans
Blue Dot	Link sharing
Broadcaster.com	Video sharing and webcam chat
Buzznet	Music and pop-culture
CarDomain	Car enthusiasts
Care2	Green living and activism
Classmates.com	School, college, work and the military
Consumating	"Consumeetings"
Couchsurfing	Hospitality
Cyworld	Young South Koreans
Dandelife	Collective narratives or "shared biographies"
DeadJournal	"Dark" blogs, based on LiveJournal
Dodgeball.com	Mobile location-based service, owned by Google
DontStayIn	Clubbing (primarily UK)
Doostang	Careers	Invite-only
eSPIN	Teens
Facebook	Started for colleges, then high schools, and now everyone.
Faceparty	British teens and 20-somethings
Flickr	Photo sharing
Flirtomatic	Flirting/Dating
Fotki	Photo sharing
Fotolog	Photoblogging
Friends Reunited	School, college, work, sport and streets
Friendster	General
Frühstückstreff	General
Gaia Online	Anime and Games
Geni.com	Families, genealogy
Graduates.com	School, college, and work
Grono.net	Poland	Invite-only
hi5	General
Hyves	General Dutch social networking website.
imeem	Instant messaging
Infield Parking	United States NASCAR fans
IRC-Galleria	Finland
iWiW	Hungary	Invite-only
Jaiku	Update friends with your status through SMS, IM, web interfaces
Joga Bonito	Football (soccer)
Last.fm	Music
LibraryThing	Book lovers
LinkedIn	Business
LiveJournal	Blogging
LunarStorm	Sweden
MEETin	General
Meetup.com	General
MiGente.com	Latinos
Mixi	Japan
MOG	Music
Multiply	"Real world" relationships
My.BarackObama.com	Political Campaign (Barack Obama)
MyChurch	Christian Churches
My Opera Community	General (blogs, photo albums, forums, groups, etc.)
MySpace	General
myYearbook	General
Netlog	Formerly known as Facebox.
Nexopia	Canada
Ning	Make your own social network
OkCupid	Dating
orkut	Owned by Google. Popular in Brazil, India. 72% and 18% of users.
OUTeverywhere	Gay
Passado	General
Piczo	Teenagers, Canadians, photo sharing
Playahead	Swedish teenagers
Playtxt	Mobile social network, location, worldwide
ProfileHeaven	British teens
Pownce	moblog for websites, files, and short updates	Invite-only
RateItAll	Consumer ratings + social networking
Reunion.com	Locating friends and family, keeping in touch
Ryze	Business
Searchles	Social Search + Social Networking ( hybrid )
Sconex	American high schools
Sermo	Physicians
Shelfari	Online community for book lovers
Skyblog	France, Belgium, French Polynesia, Guadeloupe, Martinique, New Caledonia, Senegal
Soundpedia	Web 2.0 based music community
Sportsvite	Recreational Sports
Studivz	University students, mostly in the German-speaking countries
Stumbleupon	Websurfing
TagWorld	General (tagging)
TakingITGlobal	Social action
The Doll Palace	Cartoon dolls and dress up games
The Student Center	Teens and colleges
Threadless	Custom T-shirts
TravBuddy.com	Travel
Travellerspoint	Travel
Tribe.net	General
Twitter	Update friends with your status through SMS, IM, web interfaces
Vampire Freaks	Gothic industrial culture
Vox	Blogging
WAYN	Travel & Lifestyle
WebBiographies	Genealogy & Biography
Windows Live Spaces	Blogging (formerly MSN Spaces)
Woophy	travel & photography
Xanga	Blogs and "metro" areas	Open
XING	Business	Open
Yahoo! 360°	Linked to Yahoo! 18 and older
Yelp	Local business reviewing
Zooomr	Univeral Poto Sharing