For years I've been certain that the internet in general was going to lead to the end of society. I'm all over tech sites and whatnot all day and all I see are flaming, trolling, negative posts, personal attacks, etc.
I try to never post anything online that I wouldn't say to someone's face, but it seems that 99.8% of the time people will just try to be abrasive because there's no repercussion.
My two cents at least.