In America the Internal Revenue Service used to pick who got audited based on math mistakes or discrepancies with W-2 forms -- but not any more. schwit1 shares an article from the Vanderbilt Journal of Entertainment and Technology Law describing their new technique:While tax evasion cost the U.S.$3 trillion between 2000 and 2009, one of the report's authors argues that people should be aware âoethat what they say and do onlineâ could be used against them