Invite Friends/Friend Request

Respected Team,

Basically IN current system I could invite my friends and friends can add me..And also If i am trying to invite friend who is already on the system, then it automatically sent friend request..But what i want right now that Couple of friends send me the invitation to my email address and after couple of months i registered to this site via, So as practically i should receive friend request from them in my profile but i am not getting it as of now and i want to do something like this..

Please try to help..I am in really problem  to finish this thing...Any help would really thankful...

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