An etiquette question. You've just sold your last company to Cisco, and you're celebrating with dinner at Matsuhisa in Aspen. Do you pick up the check? Not if you're Mark Pincus, you don't. As news was leaking on Friday night about the sale of his social network software to the Silicon Valley behemoth, the nervy Tribe founder was at the upscale ski resort's fanciest sushi joint with about a dozen rowdy college buddies. (So rowdy, in fact, that they drowned out diners at neighboring tables, even Stephen Colbert, who plays a loud and obnoxious news anchor on Comedy Central.) Anyway, rather than treat his friends, Pincus let them play credit card roulette. One of the others got stuck with the massive bill.