Inviting on facebook which is traceable


I’m looking for a way that users can invite other people to join using my app which is traceable in some way.
So basically a user sends an invite via Facebook (or even better if there are other ways too) to a friend of his and once the new user signed up I know which user recommended the new one.
Is there any way how to accomplish this easily? Maybe a plugin I’m just not aware of yet? It kinda feels like a standard thing to do but I simply didn’t find any good source for that.

Cheers in advance for any information :slight_smile:

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Any suggestions guys?