Facebook should add more options to the RSVP menu in the events application. This is to help event planners gauge just how many people will show up . . . and how many of them won't want to be there.
Facebook should add new photo security features which hopefully with prevent explicit and inappropriate content from being displayed on your page.
For years now, "It's Complicated" has caused incredible confusion for Facebook users. To help clear some of this up, Facebook should add several more descriptive options to help describe your bond with that special someone.