Who is the second most subscribed channel on youtube?
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What is the second most subscribed channel overall on youtube called?
PewDiePie
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Who is the second most subscribed channel for an individual on youtube?
Justin Bieber Bieber
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Who runs the second most subscribed channel on youtube?
Felix Arvid Ulf Kjellberg Kjellberg
List of most-subscribed YouTube channels
https://en.wikipedia.org/wiki/List%20of%20most-subscribed%20YouTube%20channels
In July 2013, PewDiePie overtook Jenna Marbles to become the second most-subscribed YouTube user.
PewDiePie
Channels that have been made effectively obsolete as a result of the transferal of their content (such as JustinBieberVEVO and RihannaVEVO) are excluded. 
List of most-subscribed YouTube channels
The second most subscribed channel on YouTube is PewDiePie, run by Felix Arvid Ulf Kjellberg. Justin Bieber has the second most subscribed channel on YouTube for an individual, not counting channels that have been made obsolete.