Facebook Integration » Facebook Badge
Facebook has a nice little feature called Badges. Badges make it easy for you to show off your Facebook profile, as well as your latest status updates, on your WordPress.com blog.
Create a Facebook badge
Visit the Facebook Profile Badges page, and select the information you would like to display on your badge by clicking Edit this badge and Save.
Next, click Other to get your badge HTML code:
Note: You can follow the same instructions for Facebook Page Badges.
Add a badge to your blog sidebar
Copy the HTML code and paste it into a text widget on your blog.