Cookie Crunching May Be Pumping Up Web Traffic

Internet cookies might not be as reliable an indicator of distinct Web site visitors as previously thought, according to a Monday report from Internet research company comScore.
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.
Researchers found that 31 percent of U.S. Internet users erased their first-party cookies over the course of the month. As a result, Web sites could be inflating their web traffic by as much as 150 percent, according to comScore.