Online feedback mediators completely control the amount and type of information that is made available to players. This opens an entire range of new possibilities. For example, feedback mediators can hide the detailed history of past feedback from short-term players and replace it with a summary statistic (such as the sum, mean, or median of past ratings) or with any other function of the feedback history. They can filter outlying or otherwise suspect ratings. They can offer personalized feedback profiles; that is, present different information about the same long-run player to different short-run players