20. The device of claim 15 , where, when modifying the second ranking scores, the one or more processors are to: modify the second ranking scores based on measures of reputations of the plurality of users.
15. A device comprising: one or more processors to: simultaneously calculate first ranking scores for a plurality of users and second ranking scores for a plurality of comments authored by the plurality of users, when simultaneously calculating the first ranking scores and the second ranking scores, the one or more processors being to: modify the first ranking scores using the second ranking scores, and modify the second ranking scores using the first ranking scores; and provide one or more of: a first ranked list that includes information identifying the plurality of users, the information identifying the plurality of users being ordered based on the first ranking scores, or a group of comments of the plurality of comments, the comments in the group of comments being ordered based on the second ranking scores.