You might notice a new Facebook "share" button above the first post in each topic (with the exception of the "Tips and Tricks" and "Website Bugs" boards). It will post the title of a topic and a link to the topic in your Facebook profile. When using the share button, you can toggle through the thumbnail images to be included in the Facebook post by using the "left" and "right" arrows. Alternatively, you can select the checkbox if you prefer to include no thumbnail from the topic.
Please feel free to use it liberally.