The Ghostery community has grown to more than 40 million and has garnered support from transparency and privacy advocate Edward Snowden. However, roughly half of those people have opted into the GhostRank extension, which is how Ghostery makes its money. When you opt in, Ghostery anonymizes your Internet footprint and sells it to marketers. Of course, there has been some hesitation and mild pushback. Ghostery sells data to marketers — even if it is anonymous.