We recently met Felix Arvid Ulf Kjellberg. Who, you may ask? It’s PewDiePie, the YouTube star who has the "most subscribed channel."

We got to meet PewDiePie at the Barnes & Noble store at Union Square in Manhattan. When we arrived, the line was already wrapped around the block and across the street. We found out that some people even camped out overnight. We got the chance to interview PewDiePie in a private room in the bookstore. We knew he'd arrived when we heard the crowd outside screaming his name.

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PewDiePie was at the Barnes & Noble for a book signing. There were 1,500 people waiting for wristbands and to take a picture with him. They also bought autographed copies of his book, “This Book Loves You” (Razorbill Publishers). The bookstore sold more than 2,000 books written by PewDiePie, and since there was such an amazing turnout, security had to turn people away.

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We asked PewDiePie about being the King of YouTube, and he answered every question we asked about his new book. We had such a good time! We were even interviewed by Rolling Stone magazine for having a chance to interview PewDiePie and be in Kidsday. After meeting PewDiePie, it’s clear why his nickname is the King of YouTube: he is funny, nice and so smart!

Here's a bit more about PewDiePie:
-- His YouTube channel is the most subscribed channel, with more than 5 million followers.
-- He is from Sweden.
-- He calls his fans “Bros,” and gives them all a “Brofist” when he meets them.