1. A system for creating audiences for a first shared content publisher, comprising: a data store; and a processor, coupled to the data store, to: monitor access to content of a content hosting platform by a first set of users for a reference time period, the content comprising a plurality of shared content items of a plurality of shared content publishers; divide, based on a reference split period, the monitored access into a first part and a second part, wherein the first part is defined by accesses to a first subset of the plurality of shared content items by the first set of users before the reference split period, and the second part is defined by accesses by the first set of users to second subset of the plurality of shared content items after the reference split period, wherein the first subset of the plurality of shared content items is associated with the plurality of shared content publishers, and the second subset of the plurality of shared content items is associated with the first shared content publisher; create a model based on the first part and the second part; evaluate the model based on a second set of users accessing content similar to content corresponding to the first part; create a final model based on the evaluation; and score a group of users associated with the first shared content publisher based on the final model.