As reported by ClickZ, ComScore has released its top 25 advertising networks, based on unique visitors, for January 2009.

Check out ClickZ’s article for details, but here are the top 10 and their estimated unique visitors:

1. Platform-A: 174,586 unique visitors
2. Yahoo network: 164,712 unique visitors
3. ValueClick Networks: 160,261 unique visitors
4. Google Ad Network: 158,481 unique visitors
5. Traffic Marketplace: 146,903 unique visitors
6. Yahoo sites: 146,131 unique visitors
7. Specific Media: 145,929 unique visitors
8. Tribal Fusion: 143,869 unique visitors
9. Google: 143,116 unique visitors
10. 24/7 Real Media: 141,604 unique visitors

Source: Enid Burns, “Top U.S. Ad Networks, January 2009,” ClickZ, February 27, 2009

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