Facebook integration

What should I put in those spaces?

http://imageshack.us/photo/my-images/580/immaginefp.png/

You must create an app on developer.Facebook.com that represents your store. Your facebook app will have an API Key (you put that in the first field) and an app secret key (you put that in the second field).

So to implement the login via facebook in my I have to create an ecommerce application ?

What kind of application ?

The type of application is not important.