Here are the 15 Most Popular Web 2.0 (User Generated Content) Websites. The rating is based on a constantly updated average of each website's Alexa Global Traffic Rank, and U.S. Traffic Rank from both Compete and Quantcast.
1 | YouTube
| 450,000,000 - Estimated Unique Monthly Visitors | 4 - Compete Rank | 4 - Quantcast Rank | 3 - Alexa Rank.
2 | Wikipedia
| 350,000,000 - Estimated Unique Monthly Visitors | 6 - Compete Rank | 7 - Quantcast Rank | 7 - Alexa Rank.
3 | Twitter
| 200,000,000 - Estimated Unique Monthly Visitors | 30 - Compete Rank | 5 - Quantcast Rank | 9 - Alexa Rank.
4 | craigslist
| 160,000,000 - Estimated Unique Monthly Visitors | 12 - Compete Rank | 15 - Quantcast Rank | 31 - Alexa Rank.
5 | WordPress
| 150,000,000 - Estimated Unique Monthly Visitors | 21 - Compete Rank | 23 - Quantcast Rank | 19 - Alexa Rank.
6 | Flickr
38 - eBizMBA Rank | 90,000,000 - Estimated Unique Monthly Visitors | 36 - Compete Rank | 43 - Quantcast Rank | 35 - Alexa Rank.
7 | IMDB
| 80,000,000 - Estimated Unique Monthly Visitors | 35 - Compete Rank | 46 - Quantcast Rank | 40 - Alexa Rank.
8 | Photobucket
| 75,500,000 - Estimated Unique Monthly Visitors | 30 - Compete Rank | 25 - Quantcast Rank | 72 - Alexa Rank.
9 | Blogger
| 75,000,000 - Estimated Unique Monthly Visitors | 109 - Compete Rank | 13 - Quantcast Rank | 8 - Alexa Rank.
10 | Tumblr
| 60,000,000 - Estimated Unique Monthly Visitors | 96 - Compete Rank | 38 - Quantcast Rank | 54 - Alexa Rank.
11 | eHow
| 55,000,000 - Estimated Unique Monthly Visitors | 39 - Compete Rank | 22 - Quantcast Rank | 144 - Alexa Rank.
12 | Yelp*
| 40,000,000 - Estimated Unique Monthly Visitors | 66 - Compete Rank | 72 - Quantcast Rank | 202 - Alexa Rank.
13 | TypePad
| 35,000,000 - Estimated Unique Monthly Visitors | 117 - Compete Rank | 123 - Quantcast Rank | 169 - Alexa Rank.
14 | HubPages
| 28,500,000 - Estimated Unique Monthly Visitors | 155 - Compete Rank | 82 - Quantcast Rank | 247 - Alexa Rank.
15 | Digg
| 25,100,000 - Estimated Unique Monthly Visitors | 330 - Compete Rank | 127 - Quantcast Rank | 139 - Alexa Rank.
1 | YouTube| 450,000,000 - Estimated Unique Monthly Visitors | 4 - Compete Rank | 4 - Quantcast Rank | 3 - Alexa Rank.
2 | Wikipedia| 350,000,000 - Estimated Unique Monthly Visitors | 6 - Compete Rank | 7 - Quantcast Rank | 7 - Alexa Rank.
3 | Twitter| 200,000,000 - Estimated Unique Monthly Visitors | 30 - Compete Rank | 5 - Quantcast Rank | 9 - Alexa Rank.
4 | craigslist| 160,000,000 - Estimated Unique Monthly Visitors | 12 - Compete Rank | 15 - Quantcast Rank | 31 - Alexa Rank.
5 | WordPress| 150,000,000 - Estimated Unique Monthly Visitors | 21 - Compete Rank | 23 - Quantcast Rank | 19 - Alexa Rank.
6 | Flickr38 - eBizMBA Rank | 90,000,000 - Estimated Unique Monthly Visitors | 36 - Compete Rank | 43 - Quantcast Rank | 35 - Alexa Rank.
7 | IMDB| 80,000,000 - Estimated Unique Monthly Visitors | 35 - Compete Rank | 46 - Quantcast Rank | 40 - Alexa Rank.
8 | Photobucket| 75,500,000 - Estimated Unique Monthly Visitors | 30 - Compete Rank | 25 - Quantcast Rank | 72 - Alexa Rank.
9 | Blogger| 75,000,000 - Estimated Unique Monthly Visitors | 109 - Compete Rank | 13 - Quantcast Rank | 8 - Alexa Rank.
10 | Tumblr| 60,000,000 - Estimated Unique Monthly Visitors | 96 - Compete Rank | 38 - Quantcast Rank | 54 - Alexa Rank.
11 | eHow| 55,000,000 - Estimated Unique Monthly Visitors | 39 - Compete Rank | 22 - Quantcast Rank | 144 - Alexa Rank.
12 | Yelp*| 40,000,000 - Estimated Unique Monthly Visitors | 66 - Compete Rank | 72 - Quantcast Rank | 202 - Alexa Rank.
13 | TypePad| 35,000,000 - Estimated Unique Monthly Visitors | 117 - Compete Rank | 123 - Quantcast Rank | 169 - Alexa Rank.
14 | HubPages| 28,500,000 - Estimated Unique Monthly Visitors | 155 - Compete Rank | 82 - Quantcast Rank | 247 - Alexa Rank.
15 | Digg| 25,100,000 - Estimated Unique Monthly Visitors | 330 - Compete Rank | 127 - Quantcast Rank | 139 - Alexa Rank.