add html5 facebook like button- how?

Never feel so dumb.  What's the best way to add HTML5 Facebook Like button? I see two scripts.  The first script uses the app ID goes after <body>. I put that in _header.html?   Then the second code for the plugin goes in one of HTML blocks in Page Builder?  

Edit: i'm referring to this https://developers.facebook.com/docs/reference/plugins/like/

Quote · 13 Feb 2013
 
 
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