This box also displays faces of the "likers" on your blog. Before creating a fan box you should already have a facebook fan page. If you haven't yet created, Create a page first.
Add Facebook Like Box to Blogger
1. Find out your Facebook fan page User Name/URL by visiting your Facebook fan page and copy the url in the address bar;
2. Then visit this page: http://developers.facebook.com/docs/reference/plugins/like-box
3. Paste your url into the Facebook Page URL field as it is shown below:
5. You'll be given two codes, titled HTML 5, XFBML and IFRAME. You only need the IFRAME code.
Select it and copy the code generated for your box as it is shown in the example below:
7. Click Save and you're done.