How do you promote a property or brokerage service in the age of algorithms and artificial intelligence? One method is to submit to Silicon Valley firms. Pay them ever larger shares of your income to promote your property or brokerage service with their proprietary algorithms and artificial intelligence. Understand that others will do the same and commit yourself to an endless arms race that will enrich Silicon Valley firms and stretch your profit margins.             But then you could operate outside the system. When everyone goes digital, you go analog. Promote your message person-to-person through hidden human psychology. In this focus piece, we reveal proven scientific methods for radically expanding the reach and power of word-of-mouth advertising.