How to tag a photo to be used as a thumbnail when a page is linked to on Facebook

Question

When a person posts a link on Facebook, Facebook automatically finds a photo to be used as a thumbnail that shows up in the news feed. Is there some sort of (HTML) markup to sur

Answer 1

What you want are the tags that Facebook defines in their documentation on Facebook_Share/Specifying_Meta_Tags.

You don't put the metadata around the image itself, rather, you put it in the head of the document, like this: