I’d give everyone a device that allows them to take photos of themselves and their lives, and then instantly post them online. Other people would be able to rate and comment on how well or badly they think someone is doing, based on these curated snapshots of their existence. In this experiment, people could also scroll through endless streams of these ‘highlights,’ constantly comparing their lives to others. To spice it up, I’d introduce a feature that allows people to see how many likes or comments other posts are getting, so they can feel great or miserable about themselves in real-time.