1. A method performed by one or more server devices, the method comprising: simultaneously calculating, using a processor of the one or more server devices, first ranking scores for a plurality of users and second ranking scores for a plurality of comments authored by the plurality of users, simultaneously calculating the first ranking scores and the second ranking scores including: modifying the first ranking scores using the second ranking scores, and modifying the second ranking scores using the first ranking scores; and providing, using a processor of the one or more server devices, 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, comments, in the group of comments, being ordered based on the second ranking scores.