This page is in place to show how the Joomla FaceBook Like Popup Plugin works - as you can see as soon as you enter this page, you'll get the Facebook Like Popup displayed. {facebookpopup}
The parameters of the plugin on this page are quite aggressive, such that each time you visit the page, the popup is displayed once again. Of course you shouldn't set the parameters to be as aggressive, otherwise you're going to annoy your regular users and they will sod-off to other websites :-)
See more details and how to download the Facebook Popup here.