Four stocks are keeping the bull market going

Facebook, Amazon, Netflix and Google apps (FANG) displayed on a smartphone.
Adam Jeffery | CNBC

CNBC's Jim Cramer's bullish call on FANG stocks crushed the market this year.

FANG is an acronym created by Cramer for a basket of top- performing technology stocks, which include Facebook,, Netflix and Alphabet (formerly known as Google).

However, investors are starting to worry about FANG's leadership and what it means for the market...

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