When you first install Picasa 3.9, you’ll see a big difference at the bottom of the screen.  There are only 4 buttons where there used to be many more.  This video will show you how to put them back – or use the menus for the same functionality.
The Picasa Tutorials article referenced in the video is Picasa Releases Version 3.9.  And the video referenced about the Facebook button is face18.Picasa Uploade