There are very fundamental reasons we live our lives in social networks and if we really understood the role they're playing in our society we would take better care of social networks and find ways to take advantage of their power to improve our society.

We cannot understand our humanity just by studying individuals.

People have just assumed that... if we call our Facebook acquaintances our friends, we must be influenced by them, too. But we're not.

Social media and the Internet haven't changed our capacity for social interaction any more than the Internet has changed our ability to be in love or our basic propensity to violence, because those are such fundamental human attributes.

Everyday interactions we have with other people are definitely contagious, in terms of happiness.

It is well to look around at whom, and not just what, surrounds us. Population structure will change everything. Our health, wealth, and peace depend on it.

My entire youth was spent with an incredibly ill parent... I don't think you can grow up that way and not be marked by that experience.