By BILL SHERMAN

A high school junior playing cards with his grandparents taps out messages on his phone throughout the game without missing a trick.

A middle school girl sitting in church, her hand and phone under her jacket, texts a friend without looking at the key pad.

They are part of a communications tsunami sweeping the youth culture that some experts fear may be stunting young people’s social and educational development.

Texting, and in some cases “sexting,” sending sexual messages and photos by phone, has quickly become a huge phenomenon.

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