Google stock sinks after missing fourth-quarter earnings target

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Google's stock was down 5% in after-hours trading Thursday after the company reported that it missed on earnings per share. Google says revenues were negatively impacted by tax regulation that went into affect last month.

Why it matters: Google's core business is still healthy, despite content concerns on its media platforms, increased scrutiny from European regulators, and commerce threats from Amazon. Its advertising business grew and drove revenues to beat expectations.