Now that would be considered defamation, impersonating a person, etc.. If that can be proven anywhere then that's huge, disturbing, and disgusting. I don't imagine the chances of that coming to light are very high though because people who don't gossip/bully wouldn't be using those apps, so friends of the target wouldn't likely see if there was a response - or if they did I wonder what % of friends would actually ask about the response.