1. A computer-implemented method, comprising: determining, using one or more processors, a first score for a first user based on interactions by other users with messages of the first user, or a quantity of other users that subscribe to messages of the first user; determining, using one or more processors, a second score for a second user based on interactions by other users with messages of the second user, or a quantity of other users that subscribe to messages of the second user; selecting a third user to which the first user and the second user subscribe; 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 a particular message of the third user; ranking the particular message of the third user with respect to other messages of other users based on the score for the particular message and scores for the other messages; and providing the particular message and the other messages for display by a computing device in a ranked order according to the score for the particular message and the scores for the other messages.
2. The computer-implemented method of claim 1 , wherein: determining the first score for the first user is based on the interactions by other users with messages of the first user, and determining the second score for the second user is based on the interactions by other users with messages of the second user.