When professional writers, especially ones trained in the literary arts, see horrifically bad writing online, they recoil. All their training about the value of diverse (or, you know, heteroglossic) societies and the equality of classes goes flying out the window. Social media acts as a kind of truth serum, as Marshall Kirkpatrick likes to say: This is how the masses of people talk. This is how the masses of people write. Not moonlighting bloggers. Not the 20 million NPR listeners. But the other 300 million people trying to LOL their way through boring days at office jobs or in Iraq.
I think we confuse the ability to see what everyday writing looks like – and probably has for a long time – with a change in how people write. Toss in that the traditional (usually religious) practices and sayings around serious topics like death or childbearing have lost valence, and you get people just saying what comes to mind. It’s not always pretty.