Question: Which channel in youtube has the most subscribers?
qaPairs: question: What was the Youtube channel with the most subscribers as of December 23, 2013?
answer: PewDiePie
question: What was the Youtube channel with the most subscribers as of December 12, 2013?
answer: YouTube Spotlight
question: What was the Youtube channel with the most subscribers as of December 28, 2013?
answer: PewDiePie