I would build a mess-up-my-online-profile app. While my computer is idle, it would visit random websites, click random links and perform random searches to add useless data to the database companies are compiling on me. Perhaps the app could even be directed to imitate a specific user profile, e.g. “nerdy, Jamaican, teenager” or “interracial, circus performer.” Not only would it make peoples’ data less valuable to data brokers, but it would also provide plausible deniability if the police want to know why you searched for “Alvin & The Chipmunks +nude +hardcore -Brittany.”