Web advertising : What are the MSN and Yahoo! versions of Google adSense?

Question: I found some info about adSense. I'd like to compare with MSN and Yahoo! advertising solutions. Anyone knows ?

http://index-go.com/google-services/goog...

Answers:
Yahoo has something called the Yahoo Performance Network but it is currently in a private beta and not available to the public. MSN just launched their competitor to Google AdSense called ContentAds, but this is also in private beta.

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Yahoo Search Marketing and Microsoft AdCenter

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