Facebook Site Linking Support

When someone posts a link to a web site in Facebook, it populates the link preview box with a photo and some text from the site.

If someone posts a link to my site in Facebook, it is generally just get the site's domai开发者_如何学Cn name and one of the images that appears on the site. No text appears.

I would like to be able to control what text and images appear in the link. Is there a specification that they use? Can I provide some metadata so Facebook will display what I want?

Here is Facebook's developer page on their share function.

Basically there are some simple metatags you can use to optimize what appears on FB

<meta name="title" content="title" /> 
<meta name="description" content="description " />
<link rel="image_src" href="thumbnail_image" / >

AND: The wiki article doesn't mention this, but Facebook CACHES the results of your site for awhile. So, if you're debugging & doing quick iterations, you either need to wait awhile, or rename the page (index2.html, index3.html, etc) until you find something that works.