If you’re using Google Groups, be sure to check your privacy settings. A new study conducted by Kenna Security published Friday found that, out of 9,600 public Google Groups, about a third leaked email sent through the platform. Kenna Security found the groups by researching domains (we’re guessing they Googled them) held by some of largest websites, including Fortune 500 companies, hospitals, universities and colleges, newspapers, and even U.S. government agencies. They turned up emails involving invoicing, passwords, and other credentials. Basically, all the things you don’t want shared on the web.