Portfolio We may receive an affiliate commission from anything you buy from this article. In his latest book, "The Meaning of Your Life" (to be published March 31 by Portfolio), New York Times bestselling author Arthur C. Brooks writes of a cultural crisis: an increase in anxiety and depression, concurrent with a rise in social media use, that is impinging upon our ability to find purpose in life, during what he terms an "Age of Emptiness."Read an excerpt below, and don't miss Brooks on "CBS Sunday Morning" March 22!"The Meaning of Your Life" by Arthur C. Brooks $21 at Amazon Prefer to listen? Audible has a 30-day free trial available right now. Try Audible for free In January of 2009, I temporarily left my campus home, taking a ten-year hiatus to be the president of a big nonprofit organization in Washington, DC, and didn't return until the fall of 2019. I always intended to return to academia, and after a decade, I quit my executive job and accepted a position at Harvard University.…