Ginny ~ I'm glad to hear you are thinking about joining Facebook.
However, do beware, as I have learned, that not all invitations reflect "friendship"
even though people are saying to you: let's be friends. I've been hit by at least one
invitation which is for fund-raising, not a friendship at all.
The "refuse" key/function does work, everyone. If you try Facebook, as I've recently done, you can use it to keep in touch with family, and refuse all the misc. invitations.