(Update UTC 2100: I’ve received a reply from Erik Hjort af Ornäs, the registrar of the site itself, and have included his statement below and in the comments, as well as that of Facebook. Both deny any hacking took place)
A hacker, or group of hackers, has found a back door into taking over Facebook groups, and is now doing so, claiming it to be a public service. It has taken over up to 300 different Facebook groups so far.
This is an example of one:
On each of them the group name is changed to Control Your Info, the group logo changed and its description is altered to
Hello, we hereby announce that we have officially hijacked your Facebook group.
This means we control a certain part of the information about you on Facebook. If we wanted we could make you appear in a bad way which could damage your image severly.
For example we could rename your group and call it something very inappropriate and nasty, like “I support pedophile’s rights”. But have no fear – we won’t. We just renamed it Control Your Info. Because this is really all we want:
Think about the safety in your social media life to the same extent you do in your real life.
Watch the videoclip for more information or check out www.controlyour.info for more tips soon!
We promise to restore your group name and leave the group by the end of next week. Don’t worry – we won’t mess anything up.
Best regards
/controlyour.info