I have texting on my cell phone (a minimal amount came standard), but I never use it since the phone isn't designed for it (no keyboard). While I typically do use proper grammer, I sometimes do "cheat" a bit - what can I say? As an author, my books are always grammatically correct - but that's a different situation.
Is anyone thinking that use of poor grammar (or shortcuts like IMHO or FWIW) in texting tends to flow into all areas and creates or causes bad grammar as one begins to forget the proper ways? I'm inclined to believe that it's a special case due to the difficulty (even for those good at it), the desire to keep messages short, and probably where it is occurring (like stopped at a red light). I don't accept that if the basic skills exist in the first place that texting has an impact. I suspect the problem isn't texting as much as a decline in teaching grammar, too much reliance on computer tools like Word's "grammar check" (which is far from always right), and perhaps even a decline in students caring about grammar at the stage it is normally taught.
But to be honest, while I attempt to remain grammatically-correct myself, the important thing is to communicate the message. I'd rather see a thorough and detailed post I can understand with grammar problems than a grammatically-correct post where I'm forced to ask questions to try to figure out the meaning.