http://moodmeter.media.mit.edu/
"MIT Mood Meter is designed to assess and display smiles related to the overall mood of the MIT community by putting cameras at four different locations. By gathering and aggregating facial affective information (i.e., smiles) from people around campus, the Mood Meter can estimate and reflect the overall mood of MIT during the Festival of Art, Science and Technology. [...] The data recorded during the exhibition contains heuristics about the number of smiles, their time stamps (date and clock time) and location of occurrence. The video feed displayed at each location is never recorded or transmitted over the Internet. Thus, there is no information that would uniquely identify, track or monitor people while they participate in this exhibit. "
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