Well, you can join multiple Linkshells, so you can at least be part of our group that way. As for Free Company (guilds) you can only join one, but you can still be the guest of another one. I'll probably be spending most of my time supporting the Free Company we'll have for our group of friends, but I won't hold anything against someone who wants to go for a different one. Any EoFFer is a guest to the Fat Chocobos Free Company.