Over the past decade, social media has changed the way millions of people engage both with each other and with the world around them. Connecting with old friends, sharing photos of a recent trip, keeping up with news and trends — each now requires little more than a click of a mouse, or the swipe of a finger. And the global and cross-generational success of platforms like Facebook confirm that this shift is more fundamental than fad. Today, some 80 percent of online American adults use social media regularly, and 52 percent of all Americans have at least one account of their own. Social media is here to stay.