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four out of five teenagers carry cell phones

We spent a lot of time talking about their digital footprint and that what they do can be tracked

One of the most common uses is to turn the phone into a response tool similar to clickers used with other software programs. Instead of punching a button to answer a question, students text the answer and send it to a central polling Web site the teacher projects onto a screen. Some of the sites allow students to compare answers, similar to a poll or survey.