How do you get rid of an unwelcome guest to your online party? Send him a cease-and-desist letter and block his IP address. And if he still tries to crash the party? Sue him under the Computer Fraud and Abuse Act (CFAA). That strategy was endorsed by the U.S. District Court for the Northern District of California in Craigslist, Inc. v. 3Taps Inc., et al. Despite recent controversy over whether the CFAA can be used to go after people who violate a website’s or company’s terms of service or other contractual restrictions, the court said this case was easy, since the website Craigslist had taken specific steps to block access to its computer by 3Taps.