In real estate, the mantra has always been “location, location, location” to underscore the value of being in the right place.  Now, with the advent of geo-location social networks like FourSquare, GoWalla, Hot Potato and CauseWorld that mantra extends to the digitally connected world.  Only now, the physical location takes a back seat to the sharing of physically being at the location.  And, that sharing of location check-ins is valuable for both the providers of these services and marketers.  Which is why Twitter began … Read more