Best Social Networking Site.

Adult FriendFinder	Adults Only Dating/Hook-up Network	33,000,000[2]	Open	71[3]
Advogato	Free and open source software developers	13,575[4]	Open	118,124[5]
Amie Street	Music		Open	30,628[6]
ANobii	Books		Open	13,111[7]
aSmallWorld	European jet set and social elite	270,000[8]	Invite-only	11,655[9]
Athlinks	Running, Swimming	68,496[10]	Open	107,826[11]
Avatars United	Online games.		Open	302,122[12]
Badoo	General, Popular in Europe	37,000,000[13]	Open to people 18 and older	146[14]
Bebo	General.	40,000,000[15]	Open to people 13 and older	148[16]
Bigadda	Indian Social Networking Site.	3,000,000[17]	Open to people 16 and older.	2,900[18]
BigTent	organization and communication portal for groups		Open to people 18 and older (13-18 parental permission encouraged	54,715[19]
Biip	Norwegian Community.		Requires Norwegian phone number.	16,645[20]
BlackPlanet	African-Americans	20,000,000[21]	Open	1,226[22]
Broadcaster.com	Video sharing and webcam chat	322,715[23]	Open
Buzznet	Music and pop-culture	10,000,000[24]	Open	498[25]
CafeMom	Mothers	1,250,000[26]	Open to moms and moms-to-be	3,090[27]
Cake Financial	Investing		Open
Care2	Green living and social activism	9,961,947[28]	Open
Classmates.com	School, college, work and the military	50,000,000[29]	Open to people 18 and older[30]	923[31]
Cloob	General. Popular in Iran.		Open
College Tonight	College students.		requires an e-mail address with an ".edu" ending
CouchSurfing	Worldwide network for making connections between travelers and the local communities they visit.	1,118,447[32]	Open
DailyStrength	Medical & emotional support community - Physical health, Mental health, Support groups		Open	17,465[33]
DeviantART	Art community	9,040,962[34]	Open	119[35]
Disaboom	People with disabilities. (Amputee, cerebral palsy, MS, and other disabilities.)		Open
dol2day	Politic community, Social network, Internet radio (German-speaking countries)	40,200[36]	Open
DontStayIn	Clubbing (primarily UK)		Open
Draugiem.lv	General (primarily LV, LT, HU)	2,400,000	Invitation only
Elftown	Community and wiki around Fantasy and sci-fi.	185,000[37]	Open, approval needed
Epernicus	For research scientists		Open
Eons.com	For baby boomers		Open to people 13 and older	13,675[38]
Experience Project	Life experiences		Open
Exploroo	Travel Social Networking.		Open	159,000[39]
Facebook	General.	300,000,000[40]	Open to people 13 and older	2[41]
Faceparty	General. Popular UK.	200,000[42]	Invitation only to people 18 and older.	2,481[43]
Faces.com	British teens		Open to people 13 and older
Fetlife	People who are into BDSM	32,500[44]	Open to people "of [legal] age to see adult content"	54,198[45]
Filmaffinity	Movies and TV Series	250,000[46]	Open	4,082[47]
FledgeWing	Entrepreneural community targeted towards worldwide university students.		Open to university students
Flixster	Movies	63,000,000[48]	Open to people 13 and older	309[49]
Flickr	Photo sharing, commenting, photography related networking, worldwide	32,000,000[50]	Open to people 13 and older.	37[51]
Fotolog	Photoblogging. Popular in South America and Spain.	20,000,000[52]	Open	57[53]
Friends Reunited	UK based. School, college, work, sport and streets	19,000,000[54]	Open to people 13 and older.	8,052[55]
Friendster	General. Popular in Southeast Asia. No longer popular in the western world.	90,000,000[56]	Open to people 16 and older. No children allowed.	93[57]
Frühstückstreff	General		Open
Fubar	dating, an "online bar" for 18 and older	1,200,000[58]	Open	2,609[59]
Gaia Online	Anime and games		Open to people 13 and older
GamerDNA	Computer and video games	310,000[60]	Open
Gather.com	Article, picture, and video sharing, as well as group discussions	465,000[61]	Open
Geni.com	Families, genealogy	15,000,000[62]	Open
Gogoyoko	Fair play in Music - Social networking site for musicians and music lovers		Invite only while in beta	89,513[63]
Goodreads	Library cataloging, book lovers		Open	5,305[64]
Gossipreport.com	Anonymous gossip		Open to people 16 and older
Grono.net	Poland	2,000,000	Open
Habbo	General for teens. Over 31 communities worldwide. Chat Room and user profiles.	117,000,000[65][66][67]	Open to people 13 and older	4,050[68]
hi5	General. Popular in India,Portugal, Mongolia, Thailand, Romania, Jamaica, Central Africa and Latin America. Not popular in the USA.	80,000,000[69]	Open to people 13 and older. No children allowed.	27[70]
Hospitality Club	Hospitality	328,629[71]	Open
Hyves	General, Most popular in the Netherlands.	9,000,000[72]	Open	216[73]
ibibo	Talent based social networking site that allows to promote one's self and also discover new talent. Most popular in India.	3,500,000[74]	Open	841[75]
imeem	Music, Video, Photos, Blogs	24,000,000[76]	Open	140[77]
IRC-Galleria	Finland	505,000[78]	Open to Finnish speaking people 12 and older
italki.com	Language learning social network. 100+ languages.	450,000	Open. Global.	15,500[79]
InterNations	International community		Invite-only	30,147[80]
itsmy	Mobile community worldwide, blogging, friends, personal TV-shows	2,500,000[81]
iWiW	Hungary	4,000,000[82]	Invite-only
Jaiku	General. Owned by Google.		Open to people 13 and older.
Jammer Direct	Creative resource website		Open to the General Public
kaioo	General, nonprofit	30,000[83]
Kaixin001	General. In Simplified Chinese; caters for mainland China users		Open to the General Public	102[84]
Kiwibox	General. For the users, by the users, a social network that is more than a community.	2,400,000[85]	Open to people 13 and older.	22,693[86]
Last.fm	Music	30,000,000[87]	Open to people 13 and older	262[88]
LibraryThing	Book lovers	400,000[89]	Open to people 13 and older
lifeknot	Shared interests, hobbies		Open to people 18 and older.
LinkedIn	General but mainly business	43,000,000[90]	Open to people 18 and older.	192[91]
LiveJournal	Blogging	17,564,977[92]	Open (OpenID)	56[93]
Livemocha	Online language learning - dynamic online courses in 22 languages - world’s largest community of native language speakers.	3,000,000[94]	Open	5,505[95]
LunarStorm	Sweden	[96]	Open
MEETin	General		Open
Meetup.com	General. Used to plan offline meetings for people interested in various activities.		Open to people 18 and older.
Meettheboss	Business and Finance community, worldwide.		Open
Mixi	Japan	24,323,160[97]	Invite-only	90[98]
mobikade	mobile community, UK only		Open to people 18 and older
MocoSpace	mobile community, worldwide	3,000,000[99]	Open to people 14 and older
MOG	Music		Open to people 14 and older
Moozement	Social training log		Open
Multiply	"Real world" relationships. Popular in Asia. Not popular in the western world.	10,000,000[100]	Open to people 13 and older. No children allowed.	150[101]
Muxlim	Muslim portal site	50,000[102]	Open to people 13 and older	94,338[103]
MyAnimeList	Anime themed social community	160,000[104]	Open to people 13 and older	4,500[105]
MyChurch	Christian Churches	144,295[106]	Open	33,621[107]
MyHeritage	family-oriented social network service	30,000,000 [108]	Open	4,735[109]
MyLife	Locating friends and family, keeping in touch (formerly Reunion.com)	51,000,000[110]	Open	2,311[111]
MyLOL	General. Popular in the United States, Europe and Australia.	32,000[112]	Open to ages 13 and up.	253,145[113]
My Opera Community	Blogging, mobile blogging, sharing photos, connecting with friends. Global.	3,000,000[114]	Open
MySpace	General.	263,920,102[not in citation given][115]	Open to ages 13 and up.	11[88]
myYearbook	General	5,100,000[116]	Open to age 13 and up & Grades 9 and up	894[117]
Nasza-klasa.pl	School, college and friends. Popular in Poland.	27,000,000[118]	Open
Netlog	General. Popular in Europe, Turkey, the Arab World and Canada's Québec province. Formerly known as Facebox and Redbox.[119]	54,000,000[120]	Open to people 13 and older	102[121]
Nettby	Norwegian Community.		Open
Nexopia	Canada	1,400,000[122]	Open to people 14 and older	4,362[123]
NGO Post	Non-Profit news sharing and networking, mainly in India	15,000[124]	Open	70,883[125]
Ning	Users create their own social websites and social networks		Open to people 13 and older	566[126]
Odnoklassniki	General. Popular in Russia and former Soviet republics	40,000,000[127]	Open	42[128]
OkCupid	Social networking and dating		Open to people 18 and older
OneClimate	Not for Profit Social networking and Climate Change		Open to People of all ages and locations
OneWorldTV	Not for Profit Video sharing and social networking aimed at people interested in social issues, development, environment, etc.		Open
Open Diary	First online blogging community, founded in 1998.	5,000,000[129]	Open to people 13 and older	25,713[130]
Orkut	Owned by Google. Popular in Brazil and India.[131]	67,000,000[132]	Open to people 18 and older, (Google login)	112[133]
OUTeverywhere	Gay/LGBTQ Community		Open
PartnerUp	Social networking site for entrepreneurs and small business owners	150,000	Open and Free
Passportstamp	Travel		Open
Pingsta	Collaborative platform for the world's Internetwork Experts		Invite-only, only Internet Experts
Plaxo	Aggregator	15,000,000[134]	Open
Playahead	Swedish, Danish,Norwegian teenagers		Open
Playboy U	Online college community		Open to college students with .edu e-mail address
Plurk	Micro-blogging, RSS, updates		Open	27,061[135]
Present.ly	Enterprise social networking and micro-blogging		Open
Qapacity	A a business-oriented social networking site and a business directory		Open to people 16 and older	108,745[136]
quarterlife	A social network for artists, filmmakers, musicians, and creative people		Open to people 14 and older
Qzone	General. In Simplified Chinese; caters for mainland China users	200,000,000[137]	Open to the General Public
Ravelry	Knitting and crochet	331,000[138]	Invite-only while in beta
Renren	Significant site in China. Was known as 校内 (Xiaonei) until August 2009.	15,000,000[139]	Open
ResearchGATE	Social network for scientific researchers	140,000	Open
Reverbnation	Social network for musician and bands	25,000	Open to people 16 and older
Ryze	Business	500,000[140]	Open	20,162[141]
scispace.net	Collaborative network site for scientists		By invitation, but can request an invitation
Shelfari	Books		Open
Skyrock	Social Network in French-speaking world	22,000,000[142]	Open	41[143]
SocialGO	A social network builder that allows users to build their own online communities		Open to people 18 and older.	8,457[144]
SocialVibe	Social Network for Charity	435,000	Open
Sonico.com	General. Popular in Latin America and Spanish and Portuguese speaking regions.	17,000,000[145][146]	Open to people 13 and older.	297[147]
Soundpedia	Music		Open	154,672[148]
Stickam	Live video streaming and chat.	2,000,000[149]	Open
StudiVZ	University students, mostly in the German-speaking countries. School students and those out of education sign up via its partner sites SchulerVZ and Meinvz.	15,000,000[150]	Open	173[151]
Supernova.com	Independent music fans and artists.	200,000[152]	Open
Tagged.com	General	70,000,000[153]	Open	94[154]
Talkbiznow	Business networking		Open	395,824[155]
Taltopia	Online artistic community		Open
TravBuddy.com	Travel	1,588,000[156]	Open to people 18 and older	11,357[157]
Travellerspoint	Travel		Open
tribe.net	General		Open	3,517[158]
Trombi.com	French subsidiary of Classmates.com	4,400,000[159]
Tuenti.com	Spanish-based university and High School social network. Very Popular in Spain	4,500,000	Invite-only	587[160]
Tumblr	General. Micro-blogging, RSS		Open	587[161]
Twitter	General. Micro-blogging, RSS, updates	44,500,000[162]	Open	15[163]
V Kontakte	Russian social network.	44,690,000[164]	Open	29[165]
Vampirefreaks	Gothic and industrial subculture	1,931,049[166]	Open to users 13 and over
Viadeo	European Social Networking and Campus Networking in Seven Languages	6,000,000[167]	Open
Vox	Blogging		Open	1,549[168]
Wakoopa	For computer fans that want to discover new software and games.	100,000	Open
Wasabi	General		Open
WAYN	Travel and lifestyle	10,000,000[169]	Open to people 18 and older	823[170]
WebBiographies	Genealogy and biography		Open
WeOurFamily	General with emphasis on privacy and security		Open, subscription-based	474,425[171]
Windows Live Spaces	Blogging (formerly MSN Spaces)	120,000,000[172]	Open	NA (Alexa only records data for second-level domains)
WiserEarth	Online community space for the social justice and environmental movement[173]	28,300[174]	Open to people 18 and older	80,992[175]
Xanga	Blogs and "metro" areas	27,000,000[176]	Open	230[177]
XING	Business (primarily Europe (Germany, Austria, Switzerland) and China)	7,000,000[178]	Open	1,814[179]
Xt3	Catholic social networking, created after World Youth Day 2008		Open
Yammer	Social networking for office colleagues		Must have company email
Yelp, Inc.	Local Business Review and Talk		Open
Youmeo	UK Social Network (focus on data portability)		Open
Zoo.gr	Greek Web Meeting point	890,000[180]	Open	5,634[181]