Facebook appears to have just launched a previously announced feature to their new design staging area. If you go there you’ll notice a new little “+” sign next to the tabs at the top. Click on this, and now you can choose to add “Posted Items” to the tabs at the top, as well as “Find more applications”. The “Find more applications” feature does not seem to be working yet.
This new feature allowing you to add applications to the tabs menu in the new design was announced previously by Facebook, and is said to allow your application, through just a simple “tab url” in your application settings to appear in the drop-down you can see there now when you click on the “+” sign next to the tabs. This is also consistent with the removal of “adding” an application by Facebook. Instead, you will be able to add “components” of your application to different areas of a user’s profile, which includes the tabs. Your application can have only one tab and works passively by default, meaning you have to click on something for javascript or Flash to auto-play. Nothing has been confirmed on whether Advertisements will be allowed to run within the Tabs on the new design. The tab also defaults to your Application name and cuts off at 15 characters.
See below for some more examples of the new “+” sign, and adding the Posted Items application to the tabs menu in the new design:
