Ashton Kutcher’s practiced finesse and stage presence were completely out of place at the TechCrunch50 conference earlier this week, but his appearance was the talk of the show. Kutcher wasn’t in San Francisco to run a casting call for “Beauty and the Geek,” but to launch a Web video show focused on something about which he knows a fair amount: celebrity gossip. Celebrity spokespeople are a fact of life at this point, but celebrity tech founders? Like so many things, it’s a phenomenon that gets frothy every time there’s a bubble.

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