NewsFactor - Oprah Winfrey and General Motors are adding their voices to the growing chorus against cell-phone use while driving. The queen of daytime talk was to host on Friday a Fort Wayne, Texas, activist, Diveeta Johnson, who lost her 18-year-old son, Rodney, after he lost control of a car while texting. Johnson has since persuaded 7,000 students to take a pledge not to text behind the wheel.

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