I have tried add Facebook friends sending invitations to quite large email list (~5000 emails, which I mostly get from Facebook Add me groups), but after 2 days nobody have confirmed my invitation. Then I look at my invitation history page (http://www.facebook.com/#!/invite_history.php) and it shows only 142 invitations but I sent a lot more than that. I would be grateful, if you could tell me why this method don't work for me and what to do to make it work right