top 20 Most Popular Social Networking Sites....

1 | facebook
2 - eBizMBA Rank | 250,000,000 - Estimated Unique Monthly Visitors | 2 - Compete Rank | 2 - Quantcast Rank | 2 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

2 | MySpace
16 - eBizMBA Rank | 122,000,000 - Estimated Unique Monthly Visitors | 16 - Compete Rank | 16 - Quantcast Rank | 17 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

3 | twitter
27 - eBizMBA Rank | 80,500,000 - Estimated Unique Monthly Visitors | 39 - Compete Rank | 31 - Quantcast Rank | 11 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

4 | Linkedin
47 - eBizMBA Rank | 50,000,000 - Estimated Unique Monthly Visitors | 61 - Compete Rank | 50 - Quantcast Rank | 29 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

5 | Ning
143 - eBizMBA Rank | 42,000,000 - Estimated Unique Monthly Visitors | 180 - Compete Rank | 120 - Quantcast Rank | 128 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

6 | Tagged
225 - eBizMBA Rank | 30,000,000 - Estimated Unique Monthly Visitors | 382 - Compete Rank | 151 - Quantcast Rank | 141 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

7 | classmates
228 - eBizMBA Rank | 29,000,000 - Estimated Unique Monthly Visitors | 487 - Compete Rank | *425* - Quantcast Rank | 969 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

8 | hi5
479 - eBizMBA Rank | 27,000,000 - Estimated Unique Monthly Visitors | 983 - Compete Rank | 392 - Quantcast Rank | 62 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

9 | myyearbook
617 - eBizMBA Rank | 12,000,000 - Estimated Unique Monthly Visitors | 522 - Compete Rank | 293 - Quantcast Rank | 1,036 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

10 | Meetup
635 - eBizMBA Rank | 8,000,000 - Estimated Unique Monthly Visitors | 644 - Compete Rank | 732 - Quantcast Rank | 528 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

11 | bebo
655 - eBizMBA Rank | 7,000,000 - Estimated Unique Monthly Visitors | 944 - Compete Rank | 434 - Quantcast Rank | 588 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

12 | mylife
865 - eBizMBA Rank | 6,000,000 - Estimated Unique Monthly Visitors | 118 - Compete Rank | 688 - Quantcast Rank | 1,789 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

13 | friendster
955 - eBizMBA Rank | 5,000,000 - Estimated Unique Monthly Visitors | 1,920 - Compete Rank | 643 - Quantcast Rank | 301 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

14 | myHeritage
1,097 - eBizMBA Rank | 4,800,000 - Estimated Unique Monthly Visitors | 707 - Compete Rank | 595 - Quantcast Rank | 1,989 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

15 | Multiply
1,136 - eBizMBA Rank | 4,600,000 - Estimated Unique Monthly Visitors | 2,446 - Compete Rank | 677 - Quantcast Rank | 285 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

16 | orkut
1,303 - eBizMBA Rank | 4,500,000 - Estimated Unique Monthly Visitors | 2,219 - Compete Rank | *1,630* - Quantcast Rank | 59 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

17 | badoo
1,329 - eBizMBA Rank | 4,400,000 - Estimated Unique Monthly Visitors | 3,187 - Compete Rank | *650* - Quantcast Rank | 152 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

18 | gaiaonline
1,334 - eBizMBA Rank | 4,350,000 - Estimated Unique Monthly Visitors | 1,781 - Compete Rank | 733 - Quantcast Rank | 1,489 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

19 | BlackPlanet
1,952 - eBizMBA Rank | 4,000,000 - Estimated Unique Monthly Visitors | 1,322 - Compete Rank | *1,721* - Quantcast Rank | 2,814 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA

20 | SkyRock
2,866 - eBizMBA Rank | 3,000,000 - Estimated Unique Monthly Visitors | 7,380 - Compete Rank | *980* - Quantcast Rank | 237 - Alexa Rank.
Most Popular Social Networking Websitess | Updated 6/09/2010 | eBizMBA