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When I enter a link (video, image, URL, etc.) in Facebook’s “What’s on your mind?” form, it auto-detects the link and converts it to a thumbnail with a brief description below the text-area. Can anyone provide me with insight or a link to get me going on how to achieve this?
There’s a javascript attached to the textarea change event. The javascript detects if the content of the textarea is a url, if it is, the javascript call a webservice that visit the url looking for the page title, the page description, etc, (or the open graph protocol meta tags), if it find each one of the tags they are returned to the javascript who proper organize then.
Facebook also cache this content, and if the same url is posted by another user, he uses the cache values instead of revisiting the page.
The open graph protocol meta tags: