Amazon has a radically higher multiple than Facebook. About six times higher, being charitable with Amazon's flaky net income.
Facebook will hit $13 or $14 billion in net income for fiscal 2017. Explain to me how a 27 or 28 pe ratio is unsupportable when you're growing net income at 30% or higher.
Meanwhile Google is growing its net income at 18% with a PE of 30. A far more lopsided ratio than Facebook has now, and one that is going to get much worse in just the next four quarters.
So you're wrong on both counts. Facebook has the superior value proposition based on valuation to net income + factoring growth rate.