Action links are customizable links that permit app developers to allow users to perform additional actions when the apps’ open graph stories appear in the news feed, ticker, or timeline. Facebook provided more details in a post on its developer blog:
For example, when someone checks in on foursquare and shares it on their timeline, friends can already like or comment on the resulting post through the links that appear as part of the story. Now with action links, foursquare added another link, “Save This Place,” which enables people to save a place to their foursquare to-do list directly from Facebook.
Fab.com allows people to add a product to their own Fab.com favorites with the “Fave This Product” action link.
Action links tie one action to another, and can be part of any open graph story. Developers can designate an action link for any action they define, which will then appear throughout Facebook.
Readers: Can you think of ways app developers can use Facebook’s new action links feature?