I just tried it and it said "We don't have any more friend suggestions for you right now." BUT as far as I know all my facebook friends are already playing glitch :)
I have a very large FB List, over 300 I think. I have onky had 2 friends on my invitation list. One got in. I could never get the invitation to go to the other person and removed her from the invite list this morning. I hope that maybe that will get her listed again. She wants to play and I would like to invite her.
I also have another FB friend who can't get in. She says when she applies for an invitation she is asked for a code and as she has no code, she can't even apply. I don't know if that is accurate. She may be confused but this is what she says happens. it would be great if I could just e-mail invites from here. maybe an invitation in which we enter an e-mail address. That would allow Tiny Speck to limit invitations and allow us to invite anyone.