"All preferences are learned," says bestselling author Tom Vanderbilt. Marketing experts are using this learning effect when they repeatedly offer us samples of their latest products, says Vanderbilt about the development of preferences. After all, we can’t form a preference about something we’re unfamiliar with. 

The challenge of the digital age is to escape social homophily and the kind of social media filter bubbles in which we only see things that our friends also like: