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The Girl Scouts Research Institute celebrated its tenth anniversary yesterday with the release of its latest study into the relationship between girls and social media. The findings are based on an online study with 1026 girls ages 14-17 who had social network profiles.

91% of the girls in the study said they used Facebook regularly, while only 28% said the same about MySpace. Demonstrating that teens do not eschew Twitter, 38% said they had a Twitter account, and averaged about 8 Tweets per day.

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.