Christopher Clark graphed the peak levels of and RMS levels of three hit songs a year over the past three decades. This image links to a PDF of his full poster, "A Visual History Of Loudness." Christopher Clark hide caption

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Work, Play: Facebook on the laptop, Lolcats on the iPhone, an early version of this story on the desktop and a lifeline to the outside world on those TVs — it's just an average day in the NPR newsroom. Photo illustration by Claire O'Neill/NPR hide caption

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Courtesy of Apple

Even the pope has gotten into social networking on the Pope2You Web site featuring a photograph of Pope Benedict XVI on the home page. The site translates its content into English, French, Spanish, German and Italian. Pier Paolo Cito/AP hide caption

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John G. Mabanglo/AFP/Getty Images

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