It's hard to imagine any more user growth for Facebook (FB)  now that over 2 billion users are on the platform.

But Brad McMillan, chief investment officer at Commonwealth Financial Network thinks the monetization per user has more room to run.

Though McMillan thinks there are other opportunities within the tech sector that are not FANG, including hardware and tech infrastructure companies.

FANG is an acronym for Facebook, Amazon (AMZN) , Netflix (NFLX) and Alphabet/Google (GOOGL) coined by TheStreet's Jim Cramer. 

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