1. A computer-implemented method comprising: receiving, from a client device of a requesting user of a social networking system, a request for a content item associated with one or more comments representing information provided by users of the social networking system; calculating an interest score for each of the comments associated with the content item, the interest score representing a measure of the requesting user's interest in a comment; selecting one or more comments for presentation to the requesting user based at least in part on the calculated interest scores; ranking the one or more selected comments based at least in part on the calculated interest scores associated with each of the one or more selected comments; and transmitting instructions to the client device to present the one or more selected comments in an order based at least in part on the ranking along with the associated content item.