Web visitors using a mobile device increased 34 percent year-over-year, to 56.9 million in July 2009 from 42.5 million in July 2008, according to Nielsen.

Overall, year-over-year growth among the 13-17 and 65+ age groups outpaced the growth of the total mobile Web audience, with a youth increase of 45 percent and seniors surging upwards 67 percent in July.

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