Is a bubble coming? Well, is a valuation something passably sophisticated -- or is it a version of "Facebook has 500 million users... how much is a user worth?...oh, say, 100 bucks... presto, $50 billion!"
Maybe Google's IPO idea of "e * appropriate power of 10" lends a false air of accuracy -- all those digits! Not pulled out of thin air either.
PS. Ads? What ads? Facebook has ads?!?
... when fits of creativity run strong, more than one programmer or writer has been known to abandon the desktop for the more spacious floor. -- Fred Brooks