TheStreet's Jim Cramer says sometimes a company reports a quarter that is so good, investors want to get out, and this is the case with Facebook. Cramer argues the stock is still cheap based on 2016 numbers. On the conference call Facebook said it will not be able to maintain its current level of growth. Cramer feels it was "under-promise, over-deliver" and he does not believe growth is slowing at Facebook. However, Cramer says the market is speaking loudly and the stock is getting killed.