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“The Tufts University study, published in July's Journal of Experimental Social Psychology, showed that a control group of 15 undergraduate students, both male and female, could accurately tell whether or not a man was gay, within 50 milliseconds, about 60 percent of the time when shown a photograph taken from an Internet personal ad or social networking site Facebook. The subjects overall were accurate between 55 and 70 percent of the time.” source...