At SXSW, Advertising Was This Year’s Twitter, iPad 2 Was This Year’s Foursquare

Now that the interactive portion of the SXSW conference in Austin, Texas is over, the key question is already rolling in: who won? What this really means, of course, is: what service was the breakout hit of the conference? After all, in past years, the conference has helped launch both Twitter and Foursquare into widespread usage. So the question really is: who was this year's Twitter? Or what was this year's Foursquare? The answer this year is a bit different, a little disappointing, and perhaps not all that surprising.