Amazon is probably one of the stocks that would perform the best in a stock market crash given the extent of their market dominance, they consistently post good figures and even in an economic downturn people would still look to use them, perhaps even more so because they're a cheaper alternative to the high street. Facebook would be high up on the list of stocks I'd be most inclined to short, they're highly inflated and are losing dominance all the time, their failure to capture future generations will be their downturn and before long they'll be replaced. Even now Facebook is beginning to be considered as something for old people.