1. Install and configure the Facebook OpenGraph WordPress plugin

2. Go to the WordPress Widgets administration, and drag the Facebook Connector widget to a sidebar. This widget show the facebook login button/logged user, and last visitors photos and comments.

Check the widget (no logged user):

Check the widget (logged user):

3. Go to the Facebook OpenGraph WordPress administration page (Main options). And activate the Facebook login button for comments form, and send comments to Facebook wall.

4. Go to the Facebook OpenGraph WordPress administration page (Feed Template). And configure the URL of a default comments image. This image will be shown when the user send a comment to Facebook Wall.







5. Configure the default text for comments.
{*Actor*} will be replaced with the current logged user name.
{*blogname*} will be replaced with your blog title.
{*body_short*} will be replaced with the post excerpt or body.

Check the send comments:

6. Activate the main post image tool. With this option you can configure a main image for each post. When the users comments or share a post on Facebook, the configured image of the post will shown in the facebook wall.

Test with a post:

And send a comment to facebook or like the post: