Facebook for WordPress – Facebook Developers
The Facebook plugin for WordPress packages Facebook social plugins and publishing into a single software package.
Posts may be published to the post author’s Timeline and/or a Facebook page
Many social plugins are offered and can be easily enabled – Like, Send and Follow buttons, Comments Box, & Recommendations Bar
It also supports WordPress Widgets
After activating the plugin, you will be asked to set up your Facebook application credentials (via https://developers.facebook.com/apps) to enable advanced functionality such as sending new posts to your Facebook Timeline or Facebook page or tracking Facebook-powered statistics for your site.
via Delicious https://developers.facebook.com/wordpress/