What does a geeky, unsocial Harvard suit know about the social habits of people? A lot according to his $50b valuation...
Of course it needs to have a decent understanding of a real unserved need in the customer base but imagine a well-organised, well-designed social music site that linked in bands, music sales, live streamed performances, event invites and tracking to gigs, discussions, crowd feedback etc etc. It will need some killer headline feature but I reckon there's huge opportunity there.