Sheryl Sandberg spoke to Virginia Tech’s graduating class of 2017 today, encouraging them to nurture a solid community of friends and family for post-college life. “We all need our posses, especially when life puts the obstacles in our path,” the Facebook COO said. “Out there in the world, when you leave Virginia Tech, you’re going to have to build your own posse, and sometimes that’s going to mean asking for help.” Sandberg recounted how she relied on her own posse to deal with the unexpected loss of her husband just over two years ago. “I learned that it takes strength to rely on others. There are times to lean in, and there are times to lean on,” she said. Watch the video above to hear the three things Sandberg learned from life after loss.