There doesn't seem to be any official documentation on Tumblr or Facebook as to how to add a Facebook like button within posts.
The only documentation I see is
Using the second link I can place in an individual post but based on the first link, I can only customize everything in one so I would need to get this HTML5 version
<div class="fb-like" data-href="http://myusername.tumblr.com/post/1234567" data-send="true" data-width="450" data-show-faces="true"></div>
(because Tumblr uses
Done dynamically for each post.
Also for the Open Graph tags Tumblr seems to be automatically inserting from server side their own meta tags. So which tags should I be adding from?
Would someone care to explain in detail a fool-proof solution for canonical purposes?