Pinterest is going to update their Privacy Policy on October 19, 2014. You can view what that update will include right now. These changes will only affect Pinterest users in the United States.
There are changes coming to how Pinterest uses the data it collects from Pinners. Most notably, they will start showing users ads that “you might be interested in”. Another change says: “Online advertisers typically use third party companies to audit the delivery and performance of their ads on websites and apps. We also allow these companies to collect this information on Pinterest”.
Would you like to opt-out of having Pinterest share your information with online advertisers? They suggest that you can do that by opting-out of Google Analytics by installing Google’s Browser Opt-Out Add-On. Or, you can change your account settings by shifting two boxes from “Yes” to “No”.
Pinterest notes a few things you should be aware of. The Promoted Pins can include “a pixel or similar technology” that can be used by companies to find out how well their Promoted Tweets are doing.