I also got those invites. Sometimes from the same FC a couple of times in a row. I think it's a WoW thing.

... or a bot. xP

I seriously don't get those invites. What do the FCs get for having 100 players who don't care about the other 99? Why should I join a FC if I know nothing about it?

Socializing put into numbers and corporate routine. Jeez. =/