In typical Onion fashion, they have been tweeting all day about how they are banned from Twitter:
That's just Poe's Law in action. It's hard to parody extremists because they parody themselves. People really do post precisely like this.
The joke works better on Twitter itself than on their web site. The side needs a link to it to complete the joke, but it's almost like coming into the gag halfway through.
and concludes with
"We urge our readership to stay with us as the situation develops. The easiest way to get the latest updates on our Twitter ban is by following us on Twitter."
They did also put a link to their Twitter in the article ;)