The new Facebook client adds Facebook updates to webOS so you can receive Facebook notifications in the webOS notifications area. (See the image below to see what the notifications for Facebook looks like.)
I'm not the biggest Facebook user, but I did install the update yesterday and I think Facebook users (fanatics or not) will like the new feature. With this release of Facebook , I believe that the Palm webOS client is on par with the iPhone OS client in everyway. Way to go Palm!
If you have an earlier version of the webOS Facebook app, you can upgrade to version 1.2.0 using the Updates application. If you don't have the Facebook app installed on your Palm Pre or Pixi, you can get it today from the App Catalog.