Systems and methods for capturing media content in accordance with viewer expression are disclosed. In some implementations, a method is performed at a computer system having one or more processors and memory storing one or more programs for execution by the one or more processors. The method includes: (1) obtaining a momentary reaction of the user to a portion of media content； (2) comparing the captured user reaction with one or more previously captured reactions of the user； (3) identifying the user reaction as one of a plurality of reaction types based on the comparison； (4) identifying the portion of the media content corresponding to the momentary reaction of the user； and (5) generating an electronic message that includes information regarding the portion of the media content item and information regarding the identified user reaction.
