A growing number of Internet users have taken to erasing their computer’s cookies, which are unique identifiers inserted on a user’s computer that reveal what Web sites someone has visited. While this might not seem like a catastrophic event, the deletion of these cookies could lead to inflated traffic reports for a particular Web site, according to the report.
This is a concern only to those who gather web stats with cookies. Reading the documentation for your particular software should tell you the method. Interesting to note regardless.
Source: PhysOrg