I text and post like that on my FB. (2morrow, 2nite, peeps, ttyl/s ect.) But one thing I can't stand is when people write ma instead of my. (Goin out wit ma girls 2nite) If you are using the same amount of letters for any given word than you should most def. spell the word correctly;)
I think our minds just work to fast for our hands. I don't give a crap about gram. usage or mechanics on social networks (such as this one) though.
However, I do understand your frustration, as I have seen some post where people had to go out of their way to shorten their sentences and it does come across super awkward.