I do not use Facebook for photography, but for my baby hair bow business. It is a great tool for attracting new customers, with minimal effort, and it is free!! I track my orders, and can actually see a handful of new customers who click from Facebook, and end up with a sale. One of the tricks is, when I am more active, my fans grow. Also, anything I can do to encourage my fans to comment, participate, or even join, is an opportunity for others to see my page, because their activity shows up under the news feed. If you already do a blog, it isn't that much work to copy the information you are already using, and post it on Facebook. It is really easy to add pictures as well. I started my fan page a few months ago, and am already up to nearly 600 fans, adding a few each day. It is also a fun way to stay in brief contact with your customers.
As a note, I often offer Facebook Fan only promotions. Nothing huge, but enough to make them want to join as a fan, and stay tuned to my page. It is pennies (or free) to me, but huge for free advertisement.
Of course, if anyone would like to become a fan of my
Facebook page for baby hair bows, I'd love to have you!