Recent years have been tough on optimists. Hopes that the Internet might bring people together have been crushed by the divisiveness of social media. But as head of TED, Chris Anderson has had a ringside view of the world's boldest thinkers sharing their most uplifting ideas. Inspired by them and the unique insights he gained from how online sharing transformed TED into a global beacon of transformative ideas, he believes there's a pathway back from outrage to optimism. It all comes down to reimagining the role that one of the most fundamental human virtues-generosity-can play in our connected era. What if generosity could become infectious generosity? Anderson shows how the same technologies that have bred negativity can also be mobilized as an exponential force for good, to create chain reactionsof generous behavior.