Easy...

Become a member, climb your way up, then put lots of Nazi stuff on the walls - text and links alike (Zuckerberg is a Jew, and though I do not find any evidence that this influences Facebook decisions, it reflects in zero tolerance for Nazism, which is *above and beyond the requirements of American law*). No connection? Think again - Lizard People conspiracists combine anti-pedophilia and anti-Semitism seamlessly (it gets messier when they then try to combine that with homophobia, anti-feminism, genetic luddism, Islamophobia and anti-Big-Pharma... but you get my drift).

Porn would also be able to do the trick, BUT it's easier to ban you as poster without banning the group; although it is still very easy with a flash mob approach.