How to change facebook og:image to post image link? For the facebook comments/share/etc I get the wrong thumbnail and as far as I've googled, it's due to the og:image meta tag. I'm using Drupal for Facebook module, is there a way to alter it? I found that I have to place 'rel="image_src"' somewhere, but where? At the image tag? And how can I do that using views?
The Metatags module supports OpenGraph meta data with token support, patterns, overrides for individual nodes and so on. It's a really handy module for this kind of stuff. 

http://drupal.org/project/metatag

If you're getting the wrong image show up in Facebook you could point it to the correct image using this module's token support.