I'm often NAK so I don't really have the ability to type so to speak with the correct fullstops and capital letters. Also a lot of my posts recently have had words which don't have spaces in between them but that is because lil miss ripped the space bar off the laptop and now it doesn't work properly.
I don't think there is any excuse for poor spelling on the Internet anymore...thats what spell checkers are for.
But I have to say that in general native English speakers seem to have a terrible grasp of their own grammatical language, which in turn hinders them from learning other languages. My DH never lived in the UK and only has the equivalent of GSCE level in English as a foreign language and his grammar and spelling is far superior than my own.