[nostrademons]

I think the comScore data may be biased; IIRC they rely on a toolbar that's installed along with crapware, and so it'll be biased toward users who are willing to put up with crapware.

[shawndumas]

Google Display Network Ad Planner rates Yahoo 3rd [1] (but does not count itself but does include YouTube so ...)

---- [1]: http://en.wikipedia.org/wiki/List_of_most_popular_websites