Yesterday, we floated a rumor that IAC was thinking about buying social network MyYearbook. Not the case, says Caroline McCarthy of News.com. Her sources hypothesize that MyYearbook's participation in a "mock pitch" session with IAC's Barry Diller at this week's Quadrangle conference was mistaken for something more than it was, a sort of moot court for entrepreneurs. We're not so sure. Our source told us that MyYearbook was "the winner" — and not just of that presentation. The site caught Diller's attention, possibly enough to set talks in motion. Were any potential talks nixed after word leaked to Valleywag? Quite possible. Diller likes to buy cheap, and rumors have been known to spark bidding wars. (Photo by saveena)