The latest Pew report on mobile behavior offered one fascinating contrast. Video calling on mobile phones is finally going mainstream, with usage increasing-from 7% of-cell phone owners-in 2010 to 21% in 2013. But growth in location-sharing is fizzling badly, increasing from 5% in 2011 to just 8% in 2013. The difference in growth between these two types of services is pretty stunning, particularly when you consider how much hype there was around location-sharing services back in 2011. What I find mesmerizing is the differences between various income levels. Video calling grows in popularity the more money consumers make — it is used by 16% of people making less than $30,000 and by 29% of people making more than $75,000. Nearly

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