What does one do after generating billions from an initial public stock offering? Go shopping, of course. After falling short of expectations following its somewhat helter-skelter IPO debut, Facebook simply shook off the whole thing and acquired itself some good Karma. No, we're not talking about that Karma. Instead, Facebook purchased the startup responsible for the Karma social gifting app. The move was apparently made to bolster Facebook's mobile chops -- an area the company considers ripe for opportunity. Just recently, Facebo
