The headline caught my eye (a big accomplishment these day!). When I clicked and browsed the article, What are Your Facebook Fans Really Worth, I was not disappointed. B-net (The CBS Interactive Business Network) continually posts good and varied articles; and this one about the value of Facebook fans is worth a read. Further, by taking the steps outlines in the article you'll be able to better determine how much time and energy you and your agency should be spending on Facebook marketing.