"Through... cellphone research projects, scientists are able to pinpoint 'influencers,' the people most likely to make others change their minds."

"The data can predict with uncanny accuracy where people are likely to be at any given time in the future...."

[A]t MIT, scientists who tracked student cellphones during the latest presidential election were able to deduce that two people were talking about politics, even though the researchers didn't know the content of the conversation. By analyzing changes in movement and communication patterns, researchers could also detect flu symptoms before the students themselves realized they were getting sick.