I know a lot of billing companies who are trying it, I can't really say it's working.. mostly facebook is a networking tool so most of your network will be competitors unless you join a lot of the doctor groups. IF you do it the BEST piece of advice I can recommend is to MAKE sure your facebook is completely 100% BUSINESS, in fact it should not connect you to your personal facebook at all. Nothing is more irritating than getting game requests from billing companies or watching someone rant about their boyfriend or bad date.. NOT good at all. If you want my opinion, use LinkedIn for that as your primary business network.