I want to start a FB group, but can't think of anything. Any ideas?

OK I want to start a group that actually means something, not like “I hate it when people spell bored like a board! You are not a piece of wood!” I mean that’s too long and I want it to be something cool. Like this one guy friend (who can sing – I would not be surprised if he turns out to be somebody in a few years if he gets discovered) of mine started “song of the day” where he posts a video of him singing and playing guitar to a song once a week. He’s really good. I’m not, so I’m not gonna sing or something….
So my question: What kind of group should I start?