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This may sound like a joke, but it's not: researchers at Stony Brook University in New York have found that too much Facebook usage can leave you more prone to anxiety and depression...that is, if you're a teenage girl. In a study, a group of 13-year old girls were evaluated by psychology professor Dr. Joanne Davila and her colleague, Lisa Starr. A year later, the researchers followed up with the girls, testing them for depressive symptoms.