The old saw used to be "Don't pick fights with people who buy ink by the barrel," but today it might just as well be "Don't pick fights with The Onion, you idiot, because you will be SCHOOLED."
The Syrian Electronic Army, a group affiliated with the Assad regime, apparently decided it was a good idea to fuck with America's Finest News Source. They got their hands very slightly under the hood of The Onion's twitter account, did some dumb phishing stunts, and went away.
The Onion's response: Syrian Electronic Army Has A Little Fun Before Inevitable Upcoming Deaths At Hands Of Rebels apparently didn't sit well with our "hacker" friends.
Not smart, not smart.