Our language is ever changing, you only have to see the silly season news items detailing the latest additions to the Oxford English Dictionary to realise that. I find most of these additions irritating as they seem to originate from sales and IT departments and I refuse to use them.
Not much excuse for poor spelling though (except where Aeroboro and others who are posting in a second language are concerned) and I agree that the most abused are there/their and the dreaded greengrocer's apostrophe. This smacks of laziness and projects a certain image. If people are happy to perceived in this light then that's up to them. I don't claim to be perfect but at least I make an effort.