The groups all display the same graphic and the description has been changed to the announcement of what they have done and what their intentions are:

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 [sic].

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

All members of the group get a message as well.

The hackers are presenting this stunt as a public service, but it’s not the right way to go about things.

Originally posted to the PCMag.com security blog, Security Watch.