Probably wouldn't switch, unless it was a REALLY killer app. The userbase is SO dedicated to Facebook, this is a LONG road for them to go. I can't think of any

Probably wouldn't switch, unless it was a REALLY killer app. The userbase is SO dedicated to Facebook, this is a LONG road for them to go. I can't think of anything else they've done (other than GMail) where they've moved a BIG userbase away from things they were already REALLY accustomed to. GMail did so because it was RADICALLY better than any of the alternatives at the time. What can really be RADICALLY better at what it does than facebook?