I've added the FACEBOOK "like" and "share" buttons into my Blog temple. I've tested this two buttons. It worked well. Reference URL: http://blog.xmlgadgets.com/blogger/facebook-like-button-for-blogger/
My wife told me that the original comment box in my Blog is inconvenient to use. (You have to login to Blogger or Enter your name.) Accordingly,I added the FACEBOOK comment box into my Blog temple. The process was complicated. I were still testing the program. If you are also interested in this program, here are the reference URLs: Link1, Link2.