Of course, we all know that if there's one truism in entrepreneurship, it's that change is the only constant we can rely on. And sometimes we really do need to change course. So how do you know if you should pivot or reboot?
Sure, location-based services like Foursquare and Gowalla were well represented at this year's SXSW Interactive conference. And here are three more interesting start-ups that picked up steam during the conference.