We're serious about our privacy policy and never disclose or sell your personally identifiable information. We use cookies only in the same, widely-accepted way that Twitter, Facebook and Google use them: to improve our analytics and the tools we offer our users. For example, many people want to distinguish between total clicks on bitly links and total unique users - a distinction we can't make without cookie data. Please see our privacy policy at http://bit.ly/pages/privacy/ for complete more details.