Fitbit's weak profit forecast clouds healthy holiday beat

Fitbit Inc's current-quarter profit forecast missed Wall Street estimates by a wide margin, as the wearable fitness device maker aggressively invests in new products, sending its shares down more than 16 percent in after-hours trading. The lackluster guidance overshadowed the company's comfortable quarterly revenue and profit beat in the holiday shopping season. Fitbit has been diversifying its portfolio of colorful wristbands and clippable devices that track calories, sleeping patterns and hear