Top 10 Most Popular Social Bookmarking Websites | March 2013

Here are the 10 Most Popular Social Bookmarking Websites, which are constantly updated average of each website's Alexa Global Traffic Rank, and U.S. Traffic Rank from both Compete and Quantcast."*#*" Denotes an estimate for sites with limited Compete or Quantcast data. If you know a website that should be included on this list based on its traffic rankings Please Let Us Know.

1 | Twitter
250,000,000 - Estimated Unique Monthly Visitors | 30 - Compete Rank | 5 - Quantcast Rank | 9 - Alexa Rank.
Most Popular Social Bookmarking Websites | Updated 3/18/2013
 
2 | Pinterest
85,500,000 - Estimated Unique Monthly Visitors | 42 - Compete Rank | 16 - Quantcast Rank | 36 - Alexa Rank.
Most Popular Social Bookmarking Websites | Updated 3/18/2013 

3 | Reddit 
16,000,000 - Estimated Unique Monthly Visitors | 705 - Compete Rank | 64 - Quantcast Rank | 115 - Alexa Rank.
Most Popular Social Bookmarking Websites | Updated 3/18/2013

4 | StumbleUpon
15,000,000 - Estimated Unique Monthly Visitors | 950 - Compete Rank | *150* - Quantcast Rank | 150 - Alexa Rank.
Most Popular Social Bookmarking Websites | Updated 3/18/2013

5 | BuzzFeed  
14,500,000 - Estimated Unique Monthly Visitors | 419 - Compete Rank | 132 - Quantcast Rank | 632 - Alexa Rank.
Most Popular Social Bookmarking Websites | Updated 3/18/2013

6 | Delicious 
5,500,000 - Estimated Unique Monthly Visitors | 1,396 - Compete Rank | *870* - Quantcast Rank | 342 - Alexa Rank.
Most Popular Social Bookmarking Websites | Updated 3/18/2013

7 | Tweetmeme
5,450,000 - Estimated Unique Monthly Visitors | 1,317 - Compete Rank | 877 - Quantcast Rank | 426 - Alexa Rank.
Most Popular Social Bookmarking Websites | Updated 3/18/2013

8 | digg  
4,100,000 - Estimated Unique Monthly Visitors | 3,137 - Compete Rank | 430 - Quantcast Rank | 375 - Alexa Rank.
Most Popular Social Bookmarking Websites | Updated 3/18/2013

9 | FARK
1,850,000 - Estimated Unique Monthly Visitors | 2,045 - Compete Rank | 1,019 - Quantcast Rank | 2,120 - Alexa Rank.
Most Popular Social Bookmarking Websites | Updated 3/18/2013 

10 | Slashdot
1,700,000 - Estimated Unique Monthly Visitors | 2,335 - Compete Rank | *1,825* - Quantcast Rank | 1,254 - Alexa Rank.
Most Popular Social Bookmarking Websites | Updated 3/18/2013