All I really need is someway to retrieve their friends information from these networks and giving them the ability to, presumably via a mail form, send a note which will then contain a link to my site. Said link should contain a referal variable which identifies for my server which user sent the invitation when a "friend" follows that link to my site and then signs up. This is so that I will be able to keep statistics on how many people any one user has managed to get signed up on my site.
I've been poking around the facebook developer forum to get a hang on the API usage, but for some reason I can't seem to figure it out. I suppose it should be added that I'm quite new to php so the possibility exists that the answer is staring me right in the face, and I just can't see it through all the syntax
Any help is deeply apreciated.