1. A system comprising: a data-processing system comprising one or more processors communicatively coupled to a data store, the data-processing system further comprising memory coupled to the one or more processors and storing instructions that, when executed by the one or more processors, cause the data-processing system to: receive a plurality of data points that correspond to a first user, wherein each data point in the plurality of data points represents a visit by the first user, the visit occurring at one or both of i) a determinable geolocation and ii) a determinable time; determine an entropy of the plurality of data points, based at least in part on a number of places to which the data points in the plurality of data points correspond; and cause a signal indicating an action to be performed, wherein the action to be performed is based at least in part on the determined entropy.