allthingsd.com/20121113/youtubes-magic-number/?utm_medium=referral&utm_source=pulsenewsThe video giant is handing out pass/fail grades for its new "channels." Here's the most important metric to watch.#2012#youtube·allthingsd.com·Nov 14, 2012allthingsd.com/20121113/youtubes-magic-number/?utm_medium=referral&utm_source=pulsenews
