The Bystander Effect
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The Bystander Effect is something well known in psychology. And it pretty much goes like this: the more people are present to an event the less people will be involved. Not just that the single person will be less involved, but the total probability that someone might intervene (say in front of a person on the floor sick, or a person being attacked) is lower the more people are there.

The original article that everybody cite is: Darley, J. M. & Latané, B. (1968). "Bystander intervention in emergencies: Diffusion of responsibility ". Journal of Personality and Social Psychology. 8: 377–383. doi:10.1037/h0025589.

But Wikipedia has a good page  describing it. What I am wondering, in the context of eDemocracy, is how does this effects online decision making, and online political participation. Maybe because of the bystander effect, we might get better decision using citizen juries (a sample of the population that decides for all), than using direct democracy.

Something to explore.