Writing for The Strategic Management Society, Joost Rietveld shares his latest research with co-author Joe Ploog: "On Top of The Game? The Double-Edged Sword of Incorporating Social Features into Freemium Products". The paper examines the freemium vs paid models and why even though some of the most popular digital products originated from a freemium model, there are only a small group of freemium superstars.