Here are the top 30 Social Bookmarking Sites rated by a combination of Inbound Links, Google Page Rank, Alexa Rank, and U.S. traffic data. Although no traffic metrics are completely accurate… I do believe the data below to be useful for gauging relative audience size. 1. digg.com 117,796,083 Inbound Links 16,964,445 Compete Monthly Visitors 8,700,000 Quantcast Monthly Visitors 98 Alexa Ranking Page Rank: 8 2. Technorati.com 75,306,437 Inbound Links 3,231,709 Compete Monthly Visitors 1,400,000 Quantcast Monthly Visitors 216 Alexa Ranking Page Rank: 8 3. del.icio.us 171,593,051 Inbound Links 1,699,128 Compete Monthly Visitors 1,300,000 Quantcast Monthly Visitors 248 Alexa Ranking Page Rank: 8 4. Propeller.com 997,000 Inbound Links 1,454,912 Compete Monthly Visitors 2,180,176 Quantcast Monthly Visitors 2,308 Alexa Ranking Page Rank: 7 5. StumbleUpon.com 19,050,177 Inbound Links 1,313,586 Compete Monthly Visitors 695,239 Quantcast Monthly Visitors 300 Alexa Ranking Page Rank: 8 6. reddit.com 45,307,577 Inbound Links 1,226,467 Compete Monthly Visitors 344,383 Quantcast Monthly Visitors 852 Alexa Ranking Page Rank: 7 7. Fark.com 11,438,723 Inbound Links 306,597 Compete Monthly Visitors 1,767,165 Quantcast Monthly Visitors 1,958 Alexa Ranking Page Rank: 7 8. MyBlogLog.com 1,742,265 Inbound Links 1,972,847 Compete Monthly Visitors 84,922 Quantcast Monthly Visitors 432 Alexa Ranking Page Rank: 7 9. Slashdot.org 13,555,035 Inbound Links 724,424 Compete Monthly Visitors 269,884 Quantcast Monthly Visitors 579 Alexa Ranking Page Rank: 9 10. kaboodle.com 100,266 Inbound Links 1,751,763 Compete Monthly Visitors 851,858 Quantcast Monthly Visitors 9,125 Alexa Ranking Page Rank: 6 11. Bloglines.com 50,717,948 Inbound Links 382,663 Compete Monthly Visitors 103,711 Quantcast Monthly Visitors 853 Alexa Ranking Page Rank: 9 12. newsvine.com 24,200,775 Inbound Links 315,857 Compete Monthly Visitors 203,761 Quantcast Monthly Visitors 3,977 Alexa Ranking Page Rank: 7 13. blinklist.com 23,770,576 Inbound Links 243,277 Compete Monthly Visitors 165,306 Quantcast Monthly Visitors 4,647 Alexa Ranking Page Rank: 6 14. netvouz.com 8,112,272 Inbound Links 75,507 Compete Monthly Visitors 54,325 Quantcast Monthly Visitors 15,048 Alexa Ranking Page Rank: 6 15. clipmarks.com 164,419 Inbound Links 196,107 Compete Monthly Visitors 147,131 Quantcast Monthly Visitors 6,740 Alexa Ranking Page Rank: 6 16. Furl.net 49,595,144 Inbound Links 148,975 Compete Monthly Visitors 57,547 Quantcast Monthly Visitors 4,112 Alexa Ranking Page Rank: 8 17. MisterWong 13,214,146 Inbound Links 25,416 Compete Monthly Visitors 3,432 Quantcast Monthly Visitors 1,889 Alexa Ranking Page Rank: 7 18. dzone.com 1,065,009 Inbound Links 100,784 Compete Monthly Visitors 117,897 Quantcast Monthly Visitors 5,187 Alexa Ranking Page Rank: 6 19. ma.gnolia.com 13,701,444 Inbound Links 110,662 Compete Monthly Visitors 32,363 Quantcast Monthly Visitors 7,454 Alexa Ranking Page Rank: 7 20. Tailrank.com 5,320,211 Inbound Links 71,563 Compete Monthly Visitors 35,783 Quantcast Monthly Visitors 28,920 Alexa Ranking Page Rank: 7 21. ShoutWire.com 168,480 Inbound Links 101,738 Compete Monthly Visitors 55,337 Quantcast Monthly Visitors 10,552 Alexa Ranking Page Rank: 6 22. simpy.com 13,107,730 Inbound Links 62,645 Compete Monthly Visitors 49,205 Quantcast Monthly Visitors 10,948 Alexa Ranking Page Rank: 7 23. BlogMarks.net 9,748,453 Inbound Links 61,740 Compete Monthly Visitors 28,075 Quantcast Monthly Visitors 11,880 Alexa Ranking Page Rank: 6 24. BlueDot.us 1,159,780 Inbound Links 107,717 Compete Monthly Visitors 60,045 Quantcast Monthly Visitors 12,072 Alexa Ranking Page Rank: 6 25. Spurl.net 18,628,253 Inbound Links 42,300 Compete Monthly Visitors 3,483 Quantcast Monthly Visitors 14,300 Alexa Ranking Page Rank: 6 26. Spotplex.com 541,599 Inbound Links 52,176 Compete Monthly Visitors 15,106 Quantcast Monthly Visitors 42,809 Alexa Ranking Page Rank: 6 27. linkswarm.com 150,842 Inbound Links 14,504 Compete Monthly Visitors 10,476 Quantcast Monthly Visitors 47,267 Alexa Ranking Page Rank: 5 28. Spotback.com 97,564 Inbound Links 42,838 Compete Monthly Visitors 5,037 Quantcast Monthly Visitors 42,015 Alexa Ranking Page Rank: 5 29. PlugIm.com 161,039 Inbound Links 48,078 Compete Monthly Visitors 2,000 Quantcast Monthly Visitors 13,133 Alexa Ranking Page Rank: 5 30. MyBookmarks.com 25,191 Inbound Links 10,934 Compete Monthly Visitors 7,727 Quantcast Monthly Visitors 108,226 Alexa Ranking Page Rank: 5
I really don't get how people can use social bookmarking sites as a marketing tool. If it happens naturally - great! But spending time bookmarking your own pages? i think that's really wasting time. But maybe I'm just not getting it, just tried it once.