sciencehabit writes "It's not surprising that someone could guess your friends simply by peeking at your e-mail. But a more detailed look at your electronic communications could reveal which friends are closer to you than others, according to a new study. The trick has to do with response time--the time it takes for a sender to respond to e-mails from different contacts. The fastest responses went to friends and that the slowest responses went to acquaintances, with colleagues somewhere in between."
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