Flash mobs turning violent. Original creator is 'surprised'. c'mon, it's a technology--or a use of one (which can be correctly conflated) people will use it as the wish. And as the tech gets more mainstream more diverse ways (both 'good' and 'bad') will arise
Turning buses into mobile hotspots. What happens when you 'connect' erstwhile unconnected parts of the day? This article doesn't really ask that question, although it touches on it in its last sentences. Also, presumably most of the kids had data capable phones and could text etc; what is different about access via laptops?