In this contributed article, Shachar Shamir, COO of Ranky, observes that though nearly all of us use some form of social media, few are aware of the full extent to which our data is collected and used. Our online data can take the form of political information, medical and biometric details, and other highly personal information, gathered not only from Facebook itself but also from our activity across the web. While the solution to the privacy problem ultimately needs to come from the policy end, users should nonetheless take precautions to protect their data.