Like many privacy-minded parents of elementary students, Tony Porterfield tries to keep close tabs on the personal information collected about his two sons, reports The New York Times. So when he heard that their school district in Los Altos, Calif., had adopted Edmodo, an online learning network connecting more than 20 million teachers and students around the world, he decided to check out the program.  Edmodo’s free software allows teachers to set up virtual classrooms where they can post homework assignments, give quizzes and use third-party apps to complement lessons. Students can create individual profiles, including their photograph and other details, within their teacher’s class and post comments to a communal class feed…

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