Here are the 15 Most Popular Web 2.0 (User Generated Content) Websites as derived from our eBizMBA Rank which is a 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
