Perfect grammar isn't exactly necessary on the internet, but at least being able to type understandably is. I think there should be some leeway for people who are non-native speakers though. I do have some users (really just one) on my forums that are native English speakers and absolutely refuse in any way, shape, or form to attempt typing any sort of proper English. It absolutely drives me nuts to see an American whose English is much much worse than the Chinese (just as an example, I'm not knocking them; English is damned hard to learn, especially for speakers of non-latin/non-germanic languages) people there.