rile

rile [rahyl] verb (used with object), riled, ril·ing.
Chiefly Northern and North Midland U.S.

1. to irritate or vex.
2. to roil (water or the like).

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I definitely know this word, because too many things rile me on the Internet; sometimes it's the news, but most often it's somebody whose comments go beyond the pale.  I'm getting better, though, but I sometimes will still sign up for an account just to reply to some jerk on a forum I'll never visit again.

I don't let too many people rile me on Facebook because I've already blocked most of the a-holes who post to the pages I follow.  I also do it for a few people who are friends with some of my Facebook friends but I don't want to get into it with them on my friend's wall, just out of respect for them.

I've quit commenting on YouTube videos because 99% of the time the person making some outrageous statement knows absolutely nothing about the subject.