Facebook revenue growth slows, costs weigh on profit

(Reuters) – Facebook Inc posted its slowest growth in quarterly revenue in two years and higher spending on research and development ate into profits. Facebook has warned of heavy investments in 2015 as it steps up efforts to expand a collection of products that include messaging service WhatsApp, photo-sharing service Instagram and virtual reality headset maker Oculus Rift

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Facebook revenue growth slows, costs weigh on profit