Facebook shares fall on slowed user growth

Social media giant Facebook posted third-quarter revenue of $3.2 billion, compared to estimates of $3.12 billion.

The company's stock ticked down in after-hours trading yesterday, on news of monthly active users growing 2.3 percent to 1.35 billion - slower than the growth of 3.1 percent seen in the previous quarter, according to Fox Business.

Facebook also revealed the financials of WhatsApp, the mobile messaging service it purchased for $19 billion earlier this year. It turns out the service had revenue of $10 million last year and had losses totaling $138 million.

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