On average, teens exchange 3,417 messages per month, or "seven text messages per waking hour," Nielsen found in an analysis of data from more than 65,000 cellphone subscribers. Teens have "tripled their data use in the past year," but "data use across all age groups nearly doubled," the Washington Post reports in its coverage. "Survey participants ages 13-17 used an average of 90 MB per month in … [Read more...] about Teens’ cellphone data use tripled in past year