How to lock full wordpress page, with social content locker?

Is there any plugin out there which locks the wordpress page, with a social content locker?

So the user has to post the link on their facebook page or whatever?

thanks in advance

http://wordpress.org/plugins/social-locker/
It has some nice features in the full version - you can even test the full for 7 days...
Results depend on the stuff you promote and how much you want to annoy your visitors