Here's context for anyone having a hard time following on Twitter:
https://storify.com/gkoberger/dhh-yc
Paul Graham (@paulg) = former head of YC
David Heinemeier Hansson (@dhh) = creator of basecamp/rails
Sam Altman (@sama) = current head of YC
Peter Thiel (@peterthiel) = part-time parter at YC, well-known investor, current Trump surrogate who just donated $1.25MM