Drupal has a lot of contributed modules. Today, Facebook is one of the most popular social networking sites and almost all the websites are connected with it. So, how can you connect your Drupal site with Facebook?
In Drupal 7 there is a contributed module called Facebook Events. This Facebook_Events module allows to show RSVP of Facebook event in Drupal node. This is very useful module for Drupal sites Facebook connection and also FBConnect module which can also be preffered as a linkage to Facebook events.