I think some of these aren't just about text speak but typing as you speak, as izzy says. Unless you're quoting speech then they shouldn't be used.
Of annoys me too - should of, would of.
One that's popular here of all places - a women.
People over compensating when talking about themselves and someone else (too late to work out how to word that right) and using I instead of me. My husband and I or me and my husband.