12. The computing system of claim 11 , wherein: the quality of the first comments is based on lengths of the first comments, such that determining the first score is based on the lengths of the first comments; and the quality of the second comments is based on lengths of the second comments, such that determining the second score is based on the lengths of the second comments.
11. A computing system comprising: one or more computer processors; and memory accessible to the one or more computer processors and storing instructions that, when executed by the one or more computer processors, cause performance of operations that comprise: determining, using the one or more computer processors, a first score for a first user based on a quality of first comments that have been received as replies to first content that was submitted by the first user; determining, using the one or more computer processors, a second score for a second user based on a quality of second comments that have been received as replies to second content that was submitted by the second user; selecting a third user with which the first user and the second user interact; determining, using one or more processors, a third score for the third user, based on the first score for the first user and the second score for the second user; using the third score for the third user in a determination of a score for third user content that was submitted by the third user; ranking the third user content with respect to other user content of other users based on the third score for the third user content and scores for the other user content and providing the third user content and the other user content for display by a computing device in a ranked order according to the third score for the third user content and the scores for the other user content.