Mark Zuckerberg wrote a nearly 6,000 word manifesto about the future of Facebook during February 2017. In it, Zuckerberg sees Facebook as no less than infrastructure for the next evolution of human society. He says, "in times like these, the most important thing we at Facebook can do is develop the social infrastructure to give people the power to build a global community that works for all of us."
Artificial Intelligence is expected to play a big part in building that future city on a hill. Because if Facebook succeeds in building a platform for global civic society where collective conversation evolves into collective decision-making and then collective action, then it's arguable we finally have a 21st century-native political power structure.
Imagine it actually works as advertised. Can we code or invent a capability that gives us comprehensive mastery of nature AND comprehensive mastery of human affairs? I believe that's the White Whale Zuckerberg is chasing.