I just implemented a facebook “like” button into my permalink pages of my tumblr theme. I followed this guide but found out that there is a small mistake in the code of step 3. So here is my meta tag markup for step 3:

{block:PermalinkPage}<meta property=”og:title” content=”{block:PostSummary}{PostSummary} {/block:PostSummary}”>{/block:PermalinkPage}

For a demo follow this link to a permalink of this article. Additionally, if you would like to customize your “like” button, the Facebook developer pages sure do help. Also I just found a free video how I can double my Facebook likes.

Update:

As some readers mentioned in the comments having problems with the format of the their “Like” text on Facebook, I try to clarify a bit more. You may need to additonally put the following meta tag in your theme:

<meta property=”og:site_name” content=”nerdiness devours me”/>

With this and the before mentioned meta tag, the like text shown on Facebook should be: “XY likes [meta1] on [meta2]”.