How to Add FaceBook Like Box to Blogger (blogspot)

1. Go to FaceBook Plugins page HERE.
2. Fill your Facebook Page URL or ID and customize the widget properties according to your requirements.
   
3. After customizing the widget, click Get Code. Then copy the iframe widget code as shown below:
   
4. Go to Blogger Dashboard – Layout/Design – Add a Gadget – HTML/Javascript – then paste that widget iframe code and Save. 

Credit: TipBloggers