Friend Photos is a facebook screen saver for Mac OS X. It finds photos of your friends and turns them into an elegant slideshow.
To install, simply download the screensaver and double-click on the file. This will open the screen saver in System Preferenes. Click on "Options.." and then "Login To Facebook". After logging in, you'll be able to choose which friends you'd like to see, filter by gender and relationship status, and more.