HP’s Palm unit has released an update to their Facebook application. The maintenance update includes an Exhibition update for webOS smartphones running webOS 2.x. (If you are one of the many webOS users who are locked into webOS 1.4.5, this update will do little for you.)
To get the Facebook for webOS 1.5.562 update for your webOS device, use the Software Manager application, or use the HP App Catalog to search for the Facebook application.