Well, social sharing/social media ain't going away, and Facebook is one of many ways to bring attention to your work/business.  However, one thing that's stopped me from making full use of this is Facebook's policy towards its users' intellectual property: http://www.facebook.com/terms.php.

Basically, if you post it, they help themselves to unlimited, free usage rights.

So far I've gotten around this by posting photos on my own website, or Flikr (better IP policy), and linking to it from Facebook.  But lately I'm having a harder time keeping a handle on things.  People I shoot for want to share their photos, of course, so they post them to Facebook themselves (and often only ask for permission retroactively).  I don't know that it's a good customer service approach to be draconian about this; I have it written into my contract that they need to ask me first, and even then I'll only agree to one or two, but this doesn't always stop them, and I don't know that it's worth pitching a fit and demanding that the photos be taken down.

On the one hand, it's extremely unlikely that Facebook will find and decide to use MY photos out of the millions sitting on their servers.  On the other, if they do, I lose money, and I wonder how much this "dilutes" my copyright.

I know others among you post photos directly to Facebook.  How have you been handling this dilemma?  Do you just let it go and hope for the best?  Do you have specific policies for social sharing your photos?