It is the just latest fad that has somehow turned noise and distraction, and lately marketing, into an art form consisting only of half conversations and a series of quips and glib one-liners, masquerading as human interaction and conversation.
Rather than strengthening relationships it is soaking up valuable time and attention better spent with living breathing humans in real meaningful dialog, or giving an honest day's worth of work to your employer, or even just keeping your eyes on the road.
Despite the current wave of publicity it will fade as other internet fads have. In the meantime, if I want to know what you're doing, I'll invite you to lunch and you can tell me in more than 140 characters. We'll enjoy a real conversation.
Tom Chi and Kevin Chang's Twatter Comic
Trouble with Twitter
Let Them Eat Tweets
There is no greater harm than that of time wasted.