how to force to share on iframed page?

hey guys, i've just done making the page, now i did force to like to view the real content of the page (if user is not a fan he will see a picture saying that he need to like the page first)
but i want also to force them to share the page before they can move on
how can that be done?
thanks!

There isnt a simple way to do it with a facebook share. Its possible, but it would be easier to subscribe to the comment event, maybe ask them to type "give me my free whatever please" in the facebook comments box.

then attach your redirect the the comment.create event.

more info on how to do that here - http://developers.facebook.com/docs/reference/javascript/FB.Event.subscribe/

Thanks i will try to do something