20 Most Popular Social Networking Websites | June 2009

Here are the 20 Most Popular Social Networking Websites ranked by a combination of Inbound Links, Alexa Rank, and U.S. traffic data from Compete and Quantcast. Although no traffic metrics are completely accurate we do believe the data below to be useful for gauging relative audience size.

1 | facebook.com
722,434,829 - Inbound Links | 113,014,638 - Compete Monthly Visitors | 91,200,000 - Quantcast Monthly Visitors | 4 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

2 | MySpace
345,130,806 - Inbound Links | 56,885,691 - Compete Monthly Visitors | 63,000,000 - Quantcast Monthly Visitors | 10 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

3 | twitter
486,750,806 - Inbound Links | 19,728,619 - Compete Monthly Visitors | 21,900,000 - Quantcast Monthly Visitors | 38 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

4 | LinkedIn.com
29,370,378 - Inbound Links | 11,228,746 - Compete Monthly Visitors | 11,800,000 - Quantcast Monthly Visitors | 113 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

5 | classmates.com
997,666 - Inbound Links | 14,649,224 - Compete Monthly Visitors | 9,600,000 - Quantcast Monthly Visitors | 544 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

6 | Ning.com
13,032,000 - Inbound Links | 5,881,943 - Compete Monthly Visitors | 6,800,000 - Quantcast Monthly Visitors | 108 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

7 | Bebo.com
14,368,423 - Inbound Links | 3,120,062 - Compete Monthly Visitors | 5,400,000 - Quantcast Monthly Visitors | 138 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

8 | HI5.com
8,491,287 - Inbound Links | 2,176,014 - Compete Monthly Visitors | 4,100,000 - Quantcast Monthly Visitors | 20 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

9 | Tagged.com
399,111 - Inbound Links | 3,731,972 - Compete Monthly Visitors | 5,100,000 - Quantcast Monthly Visitors | 74 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

10 | myyearbook.com
921,983 - Inbound Links | 3,025,772 - Compete Monthly Visitors | 3,800,000 - Quantcast Monthly Visitors | 483 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

11 | Multiply.com
16,629,000 - Inbound Links | 1,442,885 - Compete Monthly Visitors | 4,200,000 - Quantcast Monthly Visitors | 165 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

12 | friendster.com
6,896,127 - Inbound Links | 1,454,029 - Compete Monthly Visitors | 2,400,000 - Quantcast Monthly Visitors | 47 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

13 | Meetup
1,764,287 - Inbound Links | 2,533,191 - Compete Monthly Visitors | 2,000,000 - Quantcast Monthly Visitors | 688 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

14 | BlackPlanet
418,032 - Inbound Links | 1,473,081 - Compete Monthly Visitors | 2,200,000 - Quantcast Monthly Visitors | 1,338 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

15 | Gaia Online
528,287 - Inbound Links | 1,000,070 - Compete Monthly Visitors | 1,500,000 - Quantcast Monthly Visitors | 892 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

16 | Piczo
4,676,287 - Inbound Links | 444,457 - Compete Monthly Visitors | 996,000 - Quantcast Monthly Visitors | 1,360 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

17 | orkut.com
9,396,000 - Inbound Links | 494,781 - Compete Monthly Visitors | 475,000 - Quantcast Monthly Visitors | 102 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

18 | FotoLog.com
6,382,000 - Inbound Links | 199,838 - Compete Monthly Visitors | 507,000 - Quantcast Monthly Visitors | 124 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

19 | Skyrock.com
8,185,000 - Inbound Links | 154,991 - Compete Monthly Visitors | 217,000 - Quantcast Monthly Visitors | 43 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA

20 | badoo.com
228,287 - Inbound Links | 106,885 - Compete Monthly Visitors | 281,000 - Quantcast Monthly Visitors | 161 - Alexa Ranking.
Most Popular Social Networking Websites | Posted 6/02/2009 | eBizMBA