FANG, the gang of 4, are Facebook, Amazon, Netflix and Google. I have warned that they are risky by their P/Es. That's why SPY (capital-weighed) and the tech. ETFs are falling. I recommend to use trail stops. It could be time to unload them according to me. Investing is a guessing game. It may come back but it is too risky to me.
The institution investors drive the market. They may switch FANG to energy stocks or health care stocks, which have been below the average prices. However, most energy stocks can only be profitable when the oil price rises to $70 per barrel.