Groupon, which launched its service allowing merchants to create their own deals yesterday, might be suffering some data issues along the lines of what happened to purchase sharing startup Blippy when it exposed credit card numbers through Google search results in April. It seems as though when someone clicks on a deal link in a Groupon email and posts it anywhere else online, Google has indexed this sensitive information. It looks like this is some kind of Google Analytics tracking flaw for a Groupon marketing campaign, and the emails are from people who have referred deals to others through Groupon’s insecure links. I am unable to tell whether these emails are from people who actually purchased the deals or just signed up for Groupon’s over 20 million strong email list. Savvy Internet surfer Chris Crompton has found a flaw in Groupon’s email link encryption where adding the search term “addx” (exact Google search = allinurl: addx site:) brings up about 35 or so emails of people who have subscribed to the Groupon newsletter.
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