Mayer's final piece of advice flipped the search metaphor: instead of finding things for yourself, help others find things. She called it being 'an information fountain' and argued it was the defining shift of the information age. 'Information used to be scarce and expensive, and power came through hoarding it and brokering it. Today it's just the opposite. Power comes from sharing information. Tell everyone everything. The more valuable, the better.' She warned that information hoarding killed innovation even in successful companies, where divisions turned into 'information fortresses' that competed with each other and guarded information 'as zealously as they do from competitors.' At Google, the opposite culture — radical transparency and information sharing — had been a key driver of the company's innovation engine.