A man has filed a lawsuit seeking class-action status following an Australian technologist's assertion last week that the world's largest social networking site has been using cookies to track users even after they've logged out, CNET News reports. Perrin Aikins Davis of Illinois filed the suit against Facebook seeking unspecified damages and asking the court to "block the tracking based on alleged violations of federal wiretapping, computer fraud and abuse laws." Facebook says it will fight the complaint "vigorously." Ten advocacy groups and two U.S. representatives have called on the Federal Trade Commission to investigate the site over the use of post-logout cookies and its sharing practices.   
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