Preteens who use increasing amounts of social media perform poorer in reading, vocabulary and memory tests in early adolescence compared to those who use little or no social media. A study published in JAMA examined data from over 6,000 children ages 9 to 10 through early adolescence. Researchers classified the children into three groups: 58% used little or no social media over several years, 37% started with low-level use but spent about an hour daily on social media by age 13, and 6% spent three or more hours daily by that age. Even low users who spent about one hour per day performed 1 to 2 points lower on reading and memory tasks compared to non-users. High users performed 4 to 5 points lower than non-social media users. Jason Nagata, a pediatrician at the University of California, San Francisco and study author, said the findings were notable because even modest social media use correlated with lower cognitive scores.Read more of this story at Slashdot.