intalled it for a client in the hope that a plugin created buy highly paid facebook employees or contractors will be much better then the plugins create by students.
well, I discovered it is simply doesn't. It requires you to have a facebook developer account even if you use just a basic like button, and creating the account is not easier at all with the plugin, and it really don't even try to play well with twitter and G+.
had to edit the code to make it work the way my clients wanted.
gave it 2 stars because it might be ok for people that care only about facebook integration.