Because this is the first year I've heard of App.net and so many things nowadays fail once its had a moment of popularity? Tent is an improvement on twitter, which we want. Jabber is an improvement on msn which noone is running away from.
Are you suggesting that Jabber is a failure? You're aware that it's the underlying protocol for the massively popular Facebook Chat, as well as GTalk, right?
People are wanting to run away from Twitter, with various options. People aren't running away from MSN, they are running to its replacements such as facebook messenger
