The Facebook Exporter for iPhoto makes is VERY easy to create image galleries on Facebook. I’ve never had much luck with the built-in photo gallery tool on Facebook; it works about 50% of the time and is buggy the rest of the time. Yesterday I discovered there is a Facebook Exporter app for iPhoto.  Once you install it in iPhoto, lauch iPhoto, and select Export > Facebook (tab). You can create a new gallery or add photos to an existing gallery.

THIS is a GREAT free piece of software! Click here to download Facebook Exporter of iPhoto.