I have added a Facebook Like button on my Tumblr blog (in the template): both the iFrame code and the Open Graph tags. The button shows up normally below each blog article. When I click the button, it changes its status to 'liked', but flips back to the original state after one second.
The HTML source of the blog article is (iframe part):
<iframe class="fb_button" src="http://www.facebook.com/plugins/like.php?app_id=APP_ID&href=http://www.beyondbrands.nl/post/7354959316/startup-weekend-amsterdam-join-crowdriding&send=false&layout=button_count&width=90&show_faces=true&action=like&colorscheme=light" scrolling="no" frameborder="0" style="border:none; overflow:hidden; width:90px; height:21px;" allowTransparency="true"></iframe>
OG tags:
<meta property="og:title" content="Beyond Brands Blog, StartUp Weekend Amsterdam about to get started" />
<meta property="og:type" content="article" />
<meta property="og:url" content="http://www.beyondbrands.nl/post/7354959316/startup-weekend-amsterdam-join-crowdriding" />
<meta property="og:image" content="http://26.media.tumblr.com/avatar_6e2d27950ebb_128.png" />
<meta property="og:site_name" content="Beyond Brands Blog" />
<meta property="fb:admins" content="598414663" />