Display a Facebook Fan Box on your blog. Put the Facebook Fan Box in your sidebar using the widget mode or call the function inside your template.
If you have a page in Facebook about your blog and want to show the Facebook Fan Box with the recent updates and fans, just activate this widget or insert this line of code anywhere in your theme:
<?php facebook_fan_box('API_KEY', 'PROFILE_ID'); ?>
If you want to change updates visibility, max. number of fans, width or css properties, just do this:
<?php facebook_fan_box('API_KEY', 'PROFILE_ID', 'STREAM', 'CONNECTIONS', 'WIDTH', 'CSS', 'IFRAME', 'HEIGHT', 'LOGO', 'LANG'); ?>
STREAM: Set to 1 to display stream stories in the Fan Box or 0 to hide stream stories. (Default value is 1.)
CONNECTIONS: The number of fans to display in the Fan Box. Specifying 0 hides the list of fans in the Fan Box. You cannot display more than 100 fans. (Default value is 10 connections.)
WIDTH: The width of the Fan Box in pixels. The Fan Box must be at least 200 pixels wide at minimum. (Default value is 300 pixels.)
CSS: The URL to your own style sheet (more info: http://wiki.developers.facebook.com/index.php/Fb:fan).
HEIGHT: Limits the height used by the widget.
LOGO: Show/Hide Facebook logo bar.
LANG: Facebook Locale (en_US, es_ES...).
UPDATED: Facebook changed the social plugins so Fan Box is now Like Box (and there is a new plugin for it). If you want to use this plugin LEAVE API_KEY VALUE EMPTY.