WESTPORT, Conn. (AP) — Kate Bulkeley's pledge to stay off social media in high school worked at first. She watched the benefits pile up: She was getting excellent grades. She read lots of books. The family had lively conversations around the dinner table and gathered for movie nights on weekends.

Then, as sophomore year got underway, the unexpected problems surfaced. She missed a student government meeting arranged on Snapchat. Her Model U.N. team communicates on social media, too, causing her scheduling problems. Even the Bible Study club at her Connecticut high school uses Instagram to communicate with members.

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