Perhaps Twitter is the rock-and-roll of a generation that I am too old to get, but even with my vast ego, I find it inconceivable that anyone would want to receive an SMS of the minutiae of my life ("Driving to Costco," "Taking a break and throwing some darts").
However, every real project that I work on involves logging and developing some kind of "heartbeat monitor" for the administrators. If Twitter is easily hackable, perhaps it could be used as the infrastructure for logging. Hmm...