Will try to jolt down some Key points in case u feel lazy to see the whole thing!
He talked about:
1.Reason why we network( induction,homophily/confounding)
3.Very nice presentation/explanation of social behaviour with a great analogy drawn between chemical structure of Graphite and Diamond
4.Benefits of connected life/social network are social capital
I would still recommend all the "I am so busy" souls to have a look