Best Facebook Plugin for Multisite Publish and Connect

I am running mutlisite with buddypress and am looking for a facebook plugin that will publish posts to facebook as well as a facebook connect to comment. But, I need a plugin(s) that will only use one facebook application from the main blog to connect.

For example, the network admin sets up the facebook application and all of the childsite users only need to enter their facebook username and password and then “allow” the application ID to have access to their posts.

I cannot have my users each setting up a facebook application.

I have looked at Sharepress, Simple Facebook Connect, and Publish to Facebook 2.

Or does anyone know how to configure any of these to work the way I need it to?