In the month of April, Diane Ravitch, the 72-year-old preeminent historian of American education, sent 1,747 tweets, an average of about 58 messages per day, many between the hours of 11 p.m. and 1 a.m. On May 20 alone, Ravitch tweeted 99 times to her 13,000 followers. Linking to the news of a D.C. Public Schools investigation into test tampering under former chancellor Michelle Rhee, she asked: “How can teachers be evaluated by student test scores, when the scores are so often manipulated and inaccurate?”
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