The following is the configuration available for Facebook's Like and send buttons.
Enable Like button
This is the global switch for Facebook's button.
Generate FB Root div in the page
Facebook button is generated with the XHTML option. This requires that every single page in your site has a <div> containing Facebook's root. If you already have one included (for other extension) you can set it to No. If you don't know what this is about, don't touch this configuration and leave it to Yes.
Facebook App ID
If you have an App ID, you can set it here so your like button will be linked to your FB App.
Show Send button
Shows the send button, which allows users to send the link as a private message.
Width
In pixels, for all the Facebook div (including Send button and Faces).
Show faces
Lets you decide if people will see their friend's faces or not (of those who have liked the article).