This week Facebook is holding a developers' conference, F8, in San Francisco, and they are using the occasion to announce some big changes. Now, Facebook is well known for being in a constant state of development, not just adding new features but also removing older ones that have become obsolete or undesirable. One of the big announcements is that Facebook is launching a feature called Community Pages -- all of those TV shows, movies, books, bands and brands now have their own pages, kind of like the