Probably the best use of Facebook I've seen yet has to be the P.E.G. Practical Effects Group Page created by effects artist Jason Barnett.
It's a gold mine of photographs (over 2,000 of them) that show many behind the scenes of make-up & special effects departments. Do yourself a favor and take a look. Most of the photos look like they were submitted from personal collections of other effects artists. They have everything ranging from 50's sci-fi to Muppets to many modern day effects blockbusters.
Now if you will excuse me, I'm only on pic 500...
12 hours ago