The New York Times has a wonderful story of out-of-town hookers coming to motels near New York, advertizing on Craigslist, making a bundle, and moving on. The story is mostly about the police catching them. The head of Craigslist said that they are an honest broker for the police as well as the prostitutes.
Here is the mind-boggling number: Craigslist has 8 billion hits a day. Not all for sex, to be sure, but wow -- that is a quantity that, I believe, cannot effectively be policed.
[Note: I thought I had posted this a few days ago, but I inadvertently posted it on The Thoughtful Christian blog -- not at all appropriate. Sigh.]