Move Over, Rihanna. Meet PewDiePie, YouTube’s Biggest Star.

Move Over, Rihanna. Meet PewDiePie, YouTube’s Biggest Star.

allthingsd.com - Walt Mossberg and Kara Swisher in Media

You probably haven’t heard of PewDiePie. But your kids probably have. The 23-year-old YouTube star is a “gamecaster,” which means he makes videos of …

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