What does og:image meta data do with the Facebook Like iframe? [duplicate]

Question

Possible Duplicate:
How does Facebook Sharer select Images?

I am working on putting the Facebook "Like" iframe on a site, and I am trying to follow the example found at http://developers.facebook.com/docs/reference/plugins/like.

I am putting in code similar to this:

<meta property="og:image" content="http://ia.media-imdb.com/rock.jpg"/>

But when I "Like" a page, it doesn't do anything with the image that I am aware of. Does anyone know what that data is supposed to do?

Answer 1

type the url of a page that has the og:image property into your share box and it will auto retrieve the og data to post the link in your feed. this includes the image, description etc. It is also used when you pull the related data using the open-graph api.