Sheryl Sandberg writes a new book about overcoming adversity

The most important thing I learned is that we are not born with a certain amount of resilience. It is a muscle, and that means we can build it. We build resilience into ourselves. That's a really cool message. That is Facebook's Sheryl Sandberg delivering Virginia Tech's commencement address on Friday. And that message of resilience is a powerful one, and it comes from the heart. Sandberg, who sits on the board of Disney, our parent company, of course was blindsided by a personal tragedy, and now she's written a book about how we can all get through the hardest of times. Here's ABC's Juju Chang. After the death of her husband, Dave Goldberg, two years ago, Sheryl Sandberg found herself struggling with grief. I was going to work. I could barely get through a meeting without thinking about Dave or crying. How could I do my job? Now with her latest book, Option B, Facing Adversity, Building Resilience, and Finding Joy, Sandberg provides a very personal handbook for overcoming trauma. One of the keys, according to Sandberg and co-author Adam Grant, is to write about the pain. When people didn't say anything, I felt increasingly isolated. And so rather than wait for the person who's suffering, we can say to them, I know you're going through pain, and I'm here if you want to talk. There have been hundreds of experiments showing that if you journal about a traumatic event, Even just for 15 minutes, not only does your mental health improve, but also your physical health improves. Today, Sandberg says she's finding more joy in life each passing day. She even has a boyfriend. You talk about it in the book, this double standard that when a woman, a widow, starts to date, there's a lot of judgment and eyebrows raised. When we judge people who lost their spouses for trying to find happiness any way they do, including dating, we really hurt their recovery. And I'm hoping option B gives people the permission they deserve to rediscover joy. For Good Morning America, Juju Chang, ABC News, Menlo Park, California.