1. A method comprising: receiving a plurality of items of user-generated content; based at least in part on the user-generated content of two or more items in the plurality of items, determining that a set of items including the two or more items reflects a controversial event related to an entity of a plurality of entities, wherein at least one other set of items of the plurality of items refers to another entity of the plurality of entities; wherein the method is performed by one or more special-purpose computing devices.