I just found this quick fix from Chris Syme (who specializes in book marketing) that will change your Facebook page, instead of saying "Author" or "Writer" as your occupation, to point at your author Facebook page.
Quick and easy, but high impact because who cares more about supporting your writing than your existing friends? You just have to give them a way to find your writer presence!
Chris does a great job explaining how in this video. There are also neat resources and podcasts on book marketing on her blog that are worth checking out.