Wordpress Like/Share Locker

Is there any decent (premium or free) plugins available that lock content until that specific post/page is shared? I'd like to do this for several posts so each time that specific post or page is shared, that specific post or page is available.

Anything like this out there?

Regards.

There is a couple in codecanyon, here is one of them "Facebook Like Locker for jQuery". I use the subscribe to download to build my list

its easy to do with a javascript code, just google that