Despite stellar growth, Facebook shares dropped 7 percent in after-hours trading as some investors realized there will someday be a limit to how fast Facebook can grow. The company is on pace to reach $27 billion in revenue this year, with third-quarter profits nearly tripling to $2.38 billion.  Monthly users grew by 16 percent to 1.79 billion — much of it international. But Facebook warned that next year it would reach a limit on how many ads it could place in people’s feeds. Many analysts fully expect a slowdown in growth in 2017.  

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