FC invites? Not that I know of. I have a new character that I just made and I wasn't completely out of the starting CS and I had a FC invite. I'm sorry, I don't have any desire to be in a FC that just invites anyone and everyone that spawns in the adventurers guild. Nor do I want to be in one that spams invites to people who don't want them.

You might just be able to blacklist the person who invited? Not sure if it is a reportable offense but I would like it to be.