You can see a list of the largest 1000 sites worldwide, based on Unique Visitors (users), as measured by Ad Planner. This list is updated monthly as new Ad Planner datasets are released. The list defines sites as top-level domains.
For each site on the list, you’ll be able to see:
- The site category
- Unique Visitors (users)
- Page Views
- Whether the site has ads
Keep in mind that the list excludes adult sites, ad networks, domains that don’t have publicly visible content or don’t load properly, and certain Google sites.
The 1000 most-visited sites on the web
| Rank | Site | Category | Unique Visitors (users) | Reach | Page Views | Has Advertising |
|---|
| 1 |  facebook.com |
Social Networks | 540,000,000 | 35.2% | 570,000,000,000 | Yes |
| 2 | yahoo.com |
Web Portals | 490,000,000 | 31.8% | 70,000,000,000 | Yes |
| 3 | live.com |
Search Engines | 370,000,000 | 24.1% | 39,000,000,000 | Yes |
| 4 | wikipedia.org |
Dictionaries & Encyclopedias | 310,000,000 | 20% | 7,900,000,000 | No |
| 5 | msn.com |
Web Portals | 280,000,000 | 18.1% | 11,000,000,000 | Yes |
| 6 | microsoft.com |
Software | 230,000,000 | 14.8% | 3,300,000,000 | Yes |
| 7 | blogspot.com |
Blogging Resources & Services | 230,000,000 | 14.7% | 4,400,000,000 | Yes |
| 8 | baidu.com |
Web Portals | 230,000,000 | 15% | 27,000,000,000 | Yes |
| 9 | qq.com |
Email & Messaging | 170,000,000 | 11.1% | 25,000,000,000 | Yes |
| 10 | mozilla.com |
Internet Clients & Browsers | 140,000,000 | 9.2% | 2,100,000,000 | No |
| 11 | sina.com.cn |
Web Portals | 130,000,000 | 8.4% | 3,600,000,000 | Yes |
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See Full List: http://www.google.com/adplanner/static/top1000/
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