Slashdot contributor Bennett Haselton writes
"In 2007, I wrote that you could find troves of credit card numbers on Google, most of them still active, using the simple trick of Googling the first 8 digits of your credit card number. The trick itself had been publicized by other writers at least as far back as 2004, but in 2013, it appears to still be just as easy. One possible solution that I didn't consider last time, would be for Google itself to notify the webmasters and credit card companies of the leaked information, and then display a warning alongside the search results."
Read on for the rest of Bennett's thoughts.