This is the kind of viral marketing that executives dare not even dream about.  In fact, while outlets like Gawker have come under fire for their use of sponsored content like Bloodcopy, the folks behind AMC's "Mad Men" are reaping huge PR dividends for free.  Their personalized icons have swept over Twitter like a nuclear daisy. If you've never heard of "Mad Men," that's kind of the point.  AMC's series about an early-sixties ad agency is high on critical acclaim, but hidden away on basic cable.  The show's pitch-perfect period reproduction takes you right back to the days of 3-martini lunches, chainsmoking everywhere, and the kind of casual racism and misogyny that make last year's presidential race seem all the more miraculous.  If Proust had been smoking a cigarette, this show is what it would have tasted like. (more...)