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In what is likely to be one of the most-watched comeback attempts in recent Silicon Valley history, Groupon's former CEO starts over with GPS-guided audio walking tours.
July 30 (Bloomberg) –- Ken Block's Gymkhana video series has earned more than 160 million views on YouTube. By integrating clothing product lines into his videos, Ken has been able to turn his viral fame into hard dollars. Video by: Drew Beebe, David Yim. (Source: Bloomberg)