I echo Kara Swisher's thoughts on Facebook:

"Oh, my. Oh, my. Dig a hole and hide. The end is nigh. And how do you spell Ponzi (as in scheme) again? ... More laughable still is that Facebook, according to the Journal story, might be holding out for a $15 billion valuation. Why? Because I believe Silicon Valley can now be considered to be at Delusional Level Red. Or green, given all the cash that is being shoved in Facebook’s direction now. ... 1. Facebook is not Google: Although many in the tech sector make the comparison to the search giant, it is simply incorrect. Is Facebook like Yahoo a bit? Certainly. A newfangled version of AOL? Absolutely! A very well done media play with all sorts of interactive bells and whistles hanging off of it? Yes, ma’am. ... But in comparative terms to the search giant, Facebook is a lemonade stand."