Add a Facebook Follower Box to Your Sidebar
Do you have a Facebook page for your blog? Would you like to display it in your sidebar and show your followers as well as attract new followers? Here is how you do it.
Go to this link: https://developers.facebook.com/docs/reference/plugins/like-box/
When you get to that page you will need your Facebook Page URL. Remove the URL that is in that box and replace it with yours.
Then you can fill in any other fields you want – the only one I cared about was width and for that I used 275.
Click – Get Code
When that box comes up click in the title bar on IFRAME. Copy that code into an HTML Gadget box.
That is all there is to it – the Facebook Follower box should now appear on your blog.