Tech companies know a lot about us — a lot more than we realize. The recent scandal involving Facebook and Cambridge Analytica shined a spotlight on this issue and the lack of control we have over how companies track us online. But it’s not just what social networks know about us that can be problematic. People-finder sites, like Spokeo, amass and sometimes sell our info. Marketplace Tech host Jon Gordon spoke with Gennie Gebhart of the Electronic Frontier Foundation to find out how much of yourself you can realistically scrub from the internet.