how can i defined meta tags for related post thumbnails in tumblr? : <p>I am using shareaholic but problem is that all related post thumbnails are picking profile picture image instead of post images. Now all thumbnail images are showing same image i want different image for every thumbnail. How can i defined meta tags in head section of my tumblr theme? I tried some but i'm not successful because I have little knowledge of html and meta tags.   </p>
