Compared to the might of the iPhone App Store, and slightly-less-but-still-respectable presence of the Android Market, Palm's webOS App Catalog, used by the Pre and the Pixi, looks decidedly lacklustre.
However, it has just got a tiny bit bigger with the addition of an official Facebook application. It's not exactly extensive - just delivering an unfiltered live stream of your friends' activities with the ability to comment and "like" particular items.
You can post to it yourself, and add a picture, but that's pretty much it. No events, information, search or anything else. Still, something is better than nothing, right? You'll need webOS 1.3.1, and you should be able to find it in the webOS App Catalog.
Let us know what you think of the app in the comments.