Mark W. Schaefer is an internationally-acclaimed speaker, author and college educator. His other books include "The Content Code," "Return On Influence," and "The Tao of Twitter," the best-selling book on Twitter in the world.
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Thank you so much! RT @edmaxwell: @markwschaefer @aerialvideosusa Just listened to “Known” on a long drive. Excellent. Now I want the paperback version to highlight. Great concepts. I recommend the book to everyone. – source
Mark SchaeferMar 03, 2018