I should be switching over to Twitter at this point - blogging is passe - but I'm not an instant-network sort of guy. I don't do much where it matters to even my most intimate friends that they know right away.
I can see where we might have used it traveling when the boys were older, instant messaging "Metro 1 Stop 3 Lunch 1:30?" and receiving 3 OK's and an "I M @ Stop 3, where r u?" but those would all have been in Europe. It would be great in an emergency of some sort, which usually means "blizzard" up here, but I would have to be charged up and facile enough on normal days to be useful in an emergency.
I wouldn't be as bothered by the textspeak anymore - I regard it as a code I don't know, not bad English. When the next tech level comes and it's all by voice it might get weird. Those of us who mutter to ourselves may find our disjointed thoughts going out on network.