Unless they make their profile publicly accessible I can't see how a script would be able to check.

pop over to elance and get a script coded.

Well, here's some news that may help with that idea in the future...

I dont think I've ever heard of a script like that?

There probably aren't any because the facebook user has control over what's public and what isn't....so far.

I do think you could kinda/sorta pull it off though. See if this makes sense:

When user A arrives at the optin, hack the optin form to:
a. create a unique named php redirect page & write it to the server
b. send a link to that redirect page to user A
c. log user A's ip address

Once user B gets to redirect.php
a. check's referring site to be facebook.com
b. evaluates user B's ip address against recorded IP from user A, hoping for a mismatch.
c. If it fails either of the above, the ebook or whatever isn't sent.
d. if it passes, redirect.php emails the ebook to user A.

This wouldn't tell whether the original user actually posted it to their profile or not, but it would tell if they told someone on facebook about it. You'd probably want to make sure redirect.php can't mail 10 copies if that redirect gets 10 clicks though....

Todd

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