This plugin gives you control to initially hide part of your article from user. Content is displayed correctly once user Facebook Like or +1 your page
How do I contact you?
Is this plugin free?
Yes. but there is a pro version available too with loads of other options. Check it here http://jaspreetchahal.org/wordpress-like-to-unlock-content-plugin/
Do you have other plugins too? Yes. I have multiple free plugins available from wordpress.org. You can also visit my blog http://jaspreetchahal.org to see if I've got something for you.
Do you have any demo? Yes, Again visit http://jaspreetchahal.org/wordpress-like-to-unlock-content-plugin/
View the screenshots tab here on wordpress