I guess Twitter really doesn’t have any competiton, any meaningful competition yet, in the micro blogging space according to a post at TechCrunch Twitter May Not Have To Care About Uptime Any Longer
Without any government intervention at all Twitter has created a de-facto monopoly in the micor-blogging space. We all know from experience that it doesn’t make sense for cable companies, with regional monopolies, to put many resources towards upgrading the network and performing actual customer service (therefore, outages, downtime and no one on the phones). But Twitter may have something better than a physical monopoly – the network effect.
There are many competitors out there, and some of them are better than Twitter. But since everyone is already using Twitter, and the rate of growth is increasing, going to those competitors makes no sense.