1. A method comprising: by an access module that comprises one or more processors of a machine, accessing textual submissions contributed by members of a social network managed by a social network system, each of the textual submissions referencing a common entity described by an entity profile stored by the social network system, a subset of the accessed textual submissions each including a common token that is absent from the entity profile; by a determination module that comprises one or more processors of the machine: generating a first probability that the common token occurs within the accessed textual submissions; accessing a second probability that the common token occurs within a superset of textual submissions that includes the accessed textual submissions; and determining that the common token is descriptive of the common entity based on a statistical divergence between the first and second probabilities, the statistical divergence indicating that the common token is overrepresented among other tokens common to the accessed textual submissions; and by a generation module that comprises one or more processors of the machine; generating a supplemental profile that describes the common entity and includes the overrepresented common token.