1. A system comprising: one or more processors; and a non-transitory computer-readable medium coupled to the one or more processors and having instructions stored thereon which, when executed by the one or more processors, cause the one or more processors to perform operations comprising: storing a plurality of items, each item comprising digital content; for each item of the plurality of items, generating a quality score to provide a plurality of quality scores, each quality score indicating a quality of a respective item and being based on at least one of a status score and a content score, the status score being associated with an author user of the respective item and the content score being associated with digital content provided in the respective item; identifying occurrences of events associated with the plurality of items, each event having an event type selected from a group comprising a comment event, an endorsement event, a mute event, and a share event; for each identified occurrence of an event associated with a respective item from the plurality of items, incrementing an item weight of the respective item by an amount that is based on the event type for the event; identifying a first proper subset of the plurality of items that have item weights that meet a threshold and, in response, updating respective timestamps for the items in the first proper subset; determining an order of items based on respective quality scores and timestamps; and transmitting instructions to display items to a user based on the order, wherein updating the respective timestamp for a particular item in the first proper subset comprises assigning a timestamp to the particular item that represents a time of occurrence of a particular event associated with the particular item, and wherein the operations comprise: identifying the occurrence of the particular event associated with the particular item, incrementing the item weight of the particular item by an amount that is based on the event type for the particular event, determining that the incremented item weight of the particular item meets the threshold, and in response to determining that the incremented item weight of the particular item meets the threshold, assigning the timestamp to the particular item that represents the time of occurrence of the particular event.