Facebook has over 400 million active users and members spend over 951 man-years on the site each month. Facebook is passing Google this year as the most visited site in the US and is going to earn somewhere between $710M and $1.1B in revenue this year.
Google on the other hand have a $27B revenue run rate for 2010 [based on Q1 2010 earnings]. With similar on-site traffic they are doing 25 times Facebook’s revenue. Google have had a long time to …

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