WordPress has two main ways to integrate your website into a user’s account.
Posting to Facebook
WPbook is a plugin one installs through WordPress. It pushes your blog posts to your account on Facebook. All on has to do is install the plugin, set up a New Application on Facebook, and enter the Facebook API code into the plugin’s settings. Your posts will appear as a Box on the lefthand column of Facebook but are all saved on the server where your site is hosted.
The Like Button
WP-Facebook Connect is a plugin installed through WordPress. It adds the “like” button to your posts and forwards these as comments to your Facebook Wall. Install the plugin, set up a new application on Facebook and enter the API code into the “Facebook Connect” Settings on the backend of your site.
The Share Button
QuailPress is a plugin installed through WordPress. It adds the “share” button to your posts and forwards the comments to your Facebook Wall.
Other plugins that you can use to post to Facebook: