That does not mean data about credit card transactions are not shared. In a 2014 survey, 87% of Americans considered credit card data to be moderately or extremely private. How private are your credit card purchases? Generally, neither you nor the recipient of your payment would publicly broadcast a transaction. With this paper I am publishing the extension I created, so that users of the site can discover for themselves how much data is being shared and what can be learned. Furthermore, I analyzed the transactions of 350,000 users to uncover that the 74% of users on the site were sharing at least 5 public transactions, and 21% were sharing more than once a week, meaning that a significant number of users have enough shared data on the site to be potentially vulnerable to the kind of analysis I demonstrate with the extension. I found that many users were revealing potentially sensitive data about their social lives and purchasing habits through their use of the app. Results summary: I created a Chrome extension to analyze the extent of the information Venmo was publicly sharing about its users. I hypothesized that Venmo’s payment sharing feature, which defaults to sharing all transactions publicly with any user of the app, causes users to leak sensitive personal data about themselves, and that the problem is widespread. In addition to the privacy implications of revealing user data, previous papers have shown that this information can be used in social engineering attacks to defraud users. Despite this, Venmo has continued to have features and designs that publicly reveal large amounts of user data. In the past Venmo has had its share of security and privacy issues and has even been the target of regulatory action. The app allows users to pay each other and share the payment message, recipient and time with other users of the app. The app Venmo has quickly become one of the most popular mobile, peer-to-peer payment platforms among Millennials in the United States.