How are my friends notified if I send invites using AIM Instant Messenger?

Friends on your AIM Buddy List will be sent instant messages that inform them that you have added them as a friend. If the person already uses Facebook and has their AIM Screen Name listed on their account, they will be sent a friend request. If the person does not use Facebook yet or has not listed their AIM Screen Name, they will be sent an invitation via AIM to join Facebook. If the person is not online at the time the invitation is sent, they will receive it the next time they log in.