20 Largest Social Bookmarking Sites: April 2009

Here are the 20 Largest Social Bookmarking Sites 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. digg.com
383,598,000 - Inbound Links | 33,433,760 - Compete Monthly Visitors | 11,400,000 - Quantcast Monthly Visitors | 183 - Alexa Ranking.

2. Yahoo! Buzz
6,031,000 - Inbound Links | NA - Compete Monthly Visitors | 3,600,000 - Quantcast Monthly Visitors | NA - Alexa Ranking.

3. StumbleUpon.com
234,000,000 - Inbound Links | 4,418,609 - Compete Monthly Visitors | 1,100,000 - Quantcast Monthly Visitors | 362 - Alexa Ranking.

4. reddit.com
161,685,000 - Inbound Links | 4,908,990 - Compete Monthly Visitors | 1,300,000 - Quantcast Monthly Visitors | 441 - Alexa Ranking.

5. Technorati.com
175,287,000 - Inbound Links | 3,309,174 - Compete Monthly Visitors | 2,000,000 - Quantcast Monthly Visitors | 662 - Alexa Ranking.

6. del.icio.us
427,665,000 - Inbound Links | 1,623,083 - Compete Monthly Visitors | 317,000 - Quantcast Monthly Visitors | 2,476 - Alexa Ranking.

7. kaboodle.com
2,600,000 - Inbound Links | 3,941,212 - Compete Monthly Visitors | 2,500,000 - Quantcast Monthly Visitors | 1,694 - Alexa Ranking.

8. mixx.com
16,005,000 - Inbound Links | 879,108 - Compete Monthly Visitors | 2,200,000 - Quantcast Monthly Visitors | 645 - Alexa Ranking.

9. Propeller.com
5,725,000 - Inbound Links | 1,164,549 - Compete Monthly Visitors | 624,000 - Quantcast Monthly Visitors | 1,801 - Alexa Ranking.

10. newsvine.com
71,708,775 - Inbound Links | 1,142,779 - Compete Monthly Visitors | 1,300,000 - Quantcast Monthly Visitors | 5,545 - Alexa Ranking.

11. Fark.com
36,162,723 - Inbound Links | 652,762 - Compete Monthly Visitors | 1,300,000 - Quantcast Monthly Visitors | 4,119 - Alexa Ranking.

12. Slashdot.org
37,566,035 - Inbound Links | 862,416 - Compete Monthly Visitors | 404,000 - Quantcast Monthly Visitors | 970 - Alexa Ranking.

13. twine.com
343,090 - Inbound Links | 1,062,304 - Compete Monthly Visitors | 188,000 - Quantcast Monthly Visitors | 19,592 - Alexa Ranking.

14. clipmarks.com
461,141 - Inbound Links | 379,354 - Compete Monthly Visitors | 507,000 - Quantcast Monthly Visitors | 6,330 - Alexa Ranking.

15. dzone.com
3,867,009 - Inbound Links | 281,098 - Compete Monthly Visitors | 208,000 - Quantcast Monthly Visitors | 7,002 - Alexa Ranking.

16. faves.com
1,437,453 - Inbound Links | 159,051 - Compete Monthly Visitors | 244,000 - Quantcast Monthly Visitors | 6,198 - Alexa Ranking.

17. blinklist.com
51,912,576 - Inbound Links | 86,650 - Compete Monthly Visitors | 44,000 - Quantcast Monthly Visitors | 10,985 - Alexa Ranking.

18. diigo.com
8,933,453 - Inbound Links | 146,144 - Compete Monthly Visitors | 30,000 - Quantcast Monthly Visitors | 7,569 - Alexa Ranking.

19. simpy.com
25,805,730 - Inbound Links | 54,581 - Compete Monthly Visitors | 39,600 - Quantcast Monthly Visitors | 19,964 - Alexa Ranking.

20. BlogMarks.net
21,776,453 - Inbound Links | 40,967 - Compete Monthly Visitors | 10,500 - Quantcast Monthly Visitors | 29,744 - Alexa Ranking.