People will always use it online, I think, and probably other places too. I heard that New Zealand started letting people use "language" like that on tests, they probably changed their minds though, where I live if on the standardized test you write "i" instead of "I" or "coz" instead of "because" and so on they'll take automatically take off a point (out of four) for the grammar part of your grade and that still doesn't get people to stop doing it on the tests.