I think its the texting & auto correct on today's computer word processors.
Ive never been the best at grammar and spelling, but the auto spell check has actually helped me improve my spelling. I type it the way I think it is then I see the way it should be. Over time when I keep getting corrected I remember the correct spelling.
I believe it isn't the texting and such, just the belief that it is ok to use bad grammar. I'll text in the traditional scenes of the word, but when it comes to emails and forums, I use proper grammar.