Question: Who has the most youtube subscribers in the world 2017?
Disambiguated questions and answers: question: Which person has the most youtube subscribers in the world 2017?
Which channel has the most youtube subscribers in the world 2017?
answer: Felix Arvid Ulf Kjellberg
PewDiePie
PewDiePie
Natural Questions answer: PewDiePie (from the Wikipedia article "List of most-subscribed YouTube channels")