Top 15 Social Networking Websites

Top 15 Most Popular Social Networking Websitess | December 2010:

Here are the 15 Most Popular Social Networking Websitess as derived from which is an average of each website's Alexa Global Traffic Rank, and U.S. Traffic Rank from both Compete and Quantcast.

"*#*" Denotes an estimated Quantcast rank for websites yet to be Quantified.

1 | facebook.

550,000,000 - Estimated Unique Monthly Visitors | 3 - Compete Rank |2 - Quantcast Rank | 2 - Alexa Rank.

2 | MySpace

90,500,000 - Estimated Unique Monthly Visitors | 10 - Compete Rank| 17 - Quantcast Rank | 29 - Alexa Rank.

3 | twitter

89,800,000 - Estimated Unique Monthly Visitors | 26 - Compete Rank| 19 - Quantcast Rank | 11 - Alexa Rank.

4 | Linkedin

50,000,000 - Estimated Unique Monthly Visitors | 61 - Compete Rank| 50 - Quantcast Rank | 29 - Alexa Rank.

5 | Ning

42,000,000 - Estimated Unique Monthly Visitors | 180 - Compete Rank | 120 - Quantcast Rank | 128 - Alexa Rank.

6 | Tagged

30,000,000 - Estimated Unique Monthly Visitors | 382 - Compete Rank | 151 - Quantcast Rank | 141 - Alexa Rank.

7 | classmates

29,000,000 - Estimated Unique Monthly Visitors | 487 - Compete Rank | *425* - Quantcast Rank | 969 - Alexa Rank.

8 | hi5

27,000,000 - Estimated Unique Monthly Visitors | 983 - Compete Rank | 392 - Quantcast Rank | 62 - Alexa Rank.

9 | myyearbook

12,000,000 - Estimated Unique Monthly Visitors | 522 - Compete Rank | 293 - Quantcast Rank | 1,036 - Alexa Rank.

10 | Meetup

8,000,000 - Estimated Unique Monthly Visitors | 644 - Compete Rank | 732 - Quantcast Rank | 528 - Alexa Rank.

11 | bebo

7,000,000 - Estimated Unique Monthly Visitors | 944 - Compete Rank | 434 - Quantcast Rank | 588 - Alexa Rank.

12 | mylife

6,000,000 - Estimated Unique Monthly Visitors | 118 - Compete Rank | 688 - Quantcast Rank | 1,789 - Alexa Rank.

13 | friendster

5,000,000 - Estimated Unique Monthly Visitors | 1,920 - Compete Rank | 643 - Quantcast Rank | 301 - Alexa Rank.

14 | myHeritage

4,800,000 - Estimated Unique Monthly Visitors | 707 - Compete Rank | 595 - Quantcast Rank | 1,989 - Alexa Rank.

15 | Multiply

4,600,000 - Estimated Unique Monthly Visitors | 2,446 - Compete Rank | 677 - Quantcast Rank | 285 - Alexa Rank.

*16* | orkut

4,500,000 - Estimated Unique Monthly Visitors | 2,219 - Compete Rank | *1,630* - Quantcast Rank | 59 - Alexa Rank.