1. A method comprising: determining movement calibration information by comparing first movement data received from a plurality of client machines with media content timing information that describes when a media content item was presented at the plurality of client machines, the first movement data indicating respective movements of the plurality of client machines through space; receiving second movement data transmitted from a first client machine, the second movement data being associated with a presentation of the media content item at the first client machine, the movement data being detected at a sensor located at the first client machine, the second movement data indicating a movement of the first client machine through space; comparing the second movement data with the movement calibration information to create media content response data, the movement calibration information correlating movement data with a plurality of user responses to the presented media content item, the media content response data indicating one or more of the plurality of user responses; and storing the media content reaction data on a storage medium.