Well, not to be the grammar police but using "2" for "to" annoys me whereas I don't find it annoying when used to shorten "two". Same for using "y" for "why" or "u" for "you". It's one thing to use shorthand or acronyms or even to have a typing mistake. However, sometimes as in the case of using "2" for "to" and "y" for "why" it just baffles me. That and "l337" speak always makes me think I'm reading what is typed by a 10 year old who thinks he's l337 and thus I rarely respond to that person. I mean, to anyone who is even halfway competent at typing is it really that hard typing out the words, to, you and why? It doesn't even really save you much time, a half second at most.