Social Media Marketing

By mistake I sent out 'invitation to Facebook' to lot's of my contacts from my e-mail address book. Is there a possibility to check whom I have sent those invitations. Thanks a lot!

I really want to make a group on Facebook, but I don't know what to make it for. Can you help me think of something to make a group about? And can you give me some tips on how to get people to notice it and join or become a fan.

I really need to know how many ways there are too join a group and how you actually do it. Its important because a friend of mine has a disciplinary at work tomorrow with regards to stuff that has been put on facebook. All help is much appreciated. Many thanks in advance.