Action Links
From Facebook Developer Wiki
An action link is a short string of text that accompanies a Feed story and invites the user to take some action related to that story. An action link is a hyperlink to a URL on Facebook or your website or another third-party website. Feed stories can contain only one action link with a max of 25 characters.
Placement of the action link depends on the story size and whether or not the story has comments.
[edit] Formatting an Action Link
You specify your action link in a JSON-encoded array, like this:
When using the JavaScript Client Library (for Facebook Connect and IFrame applications), format the array like this:
You include this array in the action_links parameter when you call the stream publishing methods:
[edit] Action Link Guidelines
Please read and follow the guidelines and policies for action links.
