So Twitter is experiencing an apparent DOS (denial of service) attack. That begs the question: If twitter goes down, and twitter is the main way people get their updates, how would anyone know? Since, obviously, you can’t tweet out that Twitter is down, where do you turn to get a mass message out to all your friends that they can no longer follow you on twitter until the issue is resolved? Do we have a secret underground messaging system that runs on facebook status messages? Do we resign ourselves to text messages? Does email make a comeback? This is an interesting topic, and one that I bet some Entreprenuer is pondering right at this moment. Sure there are twitter alternatives, but really, what opportunities exist to become the ‘vice president’ of internet messaging should the president go down? Ironically, I’ll be tweeting this post. Hopefully someone sees it.