抄録
Time decay of memory is measured using social media data. The behavior of decay of memory is known to be different for individual personal memory and for social memory. For personal memory, the decay is power law like. However, the decay of social memory seems to be exponential like decay, at least for popular movies. This result is significant to analyze social phenomena using sociophysics approach. Moreover, we found that the decay form is mixed decay of exponential and power law like for the social scandal topics.
