as some of the people already mention, numbers were "leaked". There are too many incentives to make up sources (page views, manipulate google share price, to solicit more bids...)
revenues numbers are meaningless if you don't see the books for yourself. For example, a company can give 10 dollars to all new users. If this company has 35 million users, and takes in 30% of each transaction, that's 105 million dollars in revenues it can report. We wouldn't know.