How to create a popup window with "LIKE US ON FACEBOOK" to a FB page.

We don't currently have a module that will automatically popup a window after a set time and ask the user to Like your site or Facebook Page.

We do have the JFBCSocialShare module which you can use to show the Facebook Like (and other social sharing buttons) on any (or all) pages of your site. You can also choose to have the buttons 'hover' in a corner of the screen so they are persistent even as the user scrolls.

There are plenty of other features in JFBConnect that may interest you as well, like the Like Box widget (configured in the SCSocialWidget module), the social posting abilities to quickly push your content to Facebook Pages and other social networks, and automatic like/social sharing buttons in content. Authentication isn't all JFBConnect does

I hope that helps answer your questions, but if not, let me know.

Thanks,
Alex