Thank you for your answer. I have few more questions.
1. How could I view/manage all friend and friend requests relations? The problem is that now in the database there are friend relations of a user who is deleted and I do not know his name and the names of his friends. How could i manage this relations?
2. Is there a way to do it in AppHQ? Are you planning it to be available?
4. Is there a limit on how many friend requests can user1 send to user2 (in case where user2 keep rejecting the requests)?
5. Is there a limit on to how many different users can a user send friend request?