user must share befor seeing content, is it possible ?

hi.
i'm using a simple IFRAME app that shows a index.html file that inside it i put an iframe that shows my site.

i added this app to my facebook page and it shows great.

what i want to do is that people will need to press "share" before they will see my iframe.

is it possible ?

i will be happy for some guidance please,

thank you very much