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Crackdown on Craigslist 

The deal will require people who post &quot:erotic services&quot: ads on the Web site to provide a working phone number and pay a fee with a valid credit card. The Web site will provide that information to law enforcement if subpoenaed to do so.

Craigslist has also agreed to sue 14 software and Internet companies that help people who post erotic service ads circumvent the Web site’s defenses against inappropriate content and illegal activity.

Craigslist will also begin using new search technology in an effort to help authorities find missing children and victims of human trafficking.