This cartoon sums up well the impact Twitter is having on a lot of people. Hugh says he found Twitter to be "too easy," and I can't disagree. Though I don't want to admit it, the service has likely influenced, at least indirectly, the rate at which I post things here. But, unlike Hugh, who quit Twitter, I'm in for the long haul, both here and there.
Of course the upside to all of this is that the barrier to entry for [micro-]blogging is now negligible at worst, and inviting at best.