Doesn't happen all the time but this is pretty annoying
"Join ____! We are a friendly social FC that's looking to make new friends, chat and [Insert ingame stuff like Raid's etc] Join our FC today!!"
And then when you join you try and stir up conversation or ask if anyone wants to do anything and everyone even when everyone's online will remain silent, players in the FC seem to have their own clique or everyone would much rather play on their own.

I think with most < keyword FC's that do this try and bait new players just so they can raise their member list numbers.