Here are the 5 Largest Social Bookmarking Sites ranked by a combination of Inbound Links, Google Page Rank, Alexa Rank, and U.S. traffic data from Compete and Quantcast. Although no traffic metrics are completely accurate, I do believe the data below is useful for gauging relative audience size.
- Digg.com with :382,792,751 - Inbound Links | 22,578,945 - Compete Monthly Visitors | 10,300,000 - Quantcast Monthly Visitors | 124 - Alexa Ranking. | Page Rank: 8
- Yahoo!Buz with : 900,571 - Inbound Links | **128,556,575** - Compete Monthly Visitors | 2,500,000 - Quantcast Monthly Visitors | 1 - Alexa Ranking. | Page Rank: 6
- Technorati with : 75,306,437 - Inbound Links | 3,231,709 - Compete Monthly Visitors | 1,400,000 - Quantcast Monthly Visitors | 216 - Alexa Ranking. | Page Rank: 8
- del.icio.us with :171,593,051 - Inbound Links | 1,699,128 - Compete Monthly Visitors | 1,300,000 - Quantcast Monthly Visitors | 248 - Alexa Ranking. | Page Rank: 8
- Propeller.com with : 997,000 - Inbound Links | 1,454,912 - Compete Monthly Visitors | 2,180,176 - Quantcast Monthly Visitors | 2,308 - Alexa Ranking. | Page Rank: 7
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