Google

Help From Real Humans the Latest Killer App

Google Helpout, Amazon Mayday

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Right now, the greatest repository of how-to information and easy-to-learn knowledge is Google's YouTube. Want to re-shingle your roof but don't know how? YouTube has 146,000 videos on the subject.

But now Google has something even better: Live, one-on-one advice, teaching and coaching. Google is part of a larger trend of offering such expert help primarily through mobile devices like smartphones and tablets.