Scoopinion works behind the scenes, and analyzes where you spend the most time reading. It then takes that data, looks at other users with similar tastes, and recommends new stories to you. The longer you use it, the more applicable your recommendations should get. If you prefer, you can also remove stories from the recommendations to improve what you see in the future. Scoopinions does track everything you do, so it's not the most private extension around, but if you're looking for some new reading material it's worth taking a look at.