Content Locker Popup for K2 is a Plugin that once installed and enabled displays a popup that invites you to share items on Facebook, Twitter, or Google +1 before reading the full text of k2 items.
Features:
Completely locks article page usability until popup is closed or social action is completed
Cookies remember if user have not completed action
Enable/Disable Close Button
Enable/Disable Advanced Close Button that allow visitors to close popup by clicking outside of the popup or by pressing escape key