It says that facebook is to "see your friends' activity". It's probably just a way to promote the application via facebook, as there's no real benefit.

There's no price, it's to show the movies currently showing in cinemas, and the hours at the bottom.

The layout is nice but my browser seems to struggle a bit.

The Facebook integration is deeper than only publishing to newsfeeds: it reads and writes to the Open Graph which allow data mining for movies recommendations.

It's a free service and it uses Facebook Connect to access the user's graph (friends, movies and other interests) in order to build recommandations.