Unable to Send Facebook Friend Requests
You Have sent a Large Number of Friend Requests
This can happen if you have sent a large number of friend requests within a short span of time just recently. Then, your friend requesting feature may temporarily get disabled.
Friend Request to may have Blocked
At times, one does not realise it but the person you are trying to send a friend request to may have blocked certain names out of those who can send friend requests to them.
Friends or Friends of Friends may not wish to have Requests
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