Ryan Holiday, author of a new book entitled Growth Hacker Marketing: A Primer on the Future of PR, Marketing, and Advertising, explains why growth hacking is a more efficient method of marketing than traditional marketing. Holiday is a media and marketing strategist by trade. Holiday believes growth hacking is the strategy that was behind the successes obtained by Facebook, Twitter, and other huge successful companies around the world.

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Ryan Holiday: Why All Marketers Should Be Growth Hackers – Forbes