Facebook Like Code Error-The reference to entity "appId" must end withthe ';' delimiter

The Error is this-   Error parsing XML, line 658, column 62: The reference to entity "appId" must end with the ';' delim...

How To Add Facebook Like Box To Blogger

Today we will learn how to add a facebook like box in Bloggers Blog. Social networking websites like Facebook, Twitter and Google+ are pro...