From the Boston Globe:

New England in brief:
Prostitution sting nets 7 arrests
August 13, 2007

A team of detectives trolled the website Craigslist for ads listing erotic services, and on Wednesday arrested five women and two men on prostitution-related charges, before a posting alerted other Craigslist users about the sting. "They would have kept going all night," said Sergeant Christopher Werner of the West Bridgewater Police Department. All seven pleaded not guilty in Brockton District Court, Werner said.

http://www.boston.com/news/local/articles/2007/08/13/prostitution_sting_nets_7_arrests/