I remember when "ain't" wasn't a word.

semantics go through an evolution of their own, which incorporates the method used to incorporate ideas. most of the time, those boundaries are pretty well defined. someone who doesn't spend all their time on the internet (i know... what?!!) is not going to speak like that in real life. i caught myself saying "lol" in real life the other day to something funny and that almost disturbed me.

take ebonics as an example; most definately a subculture language that evolved over a perod of time and is pretty much confinced to a certain scope of people.