Facebook quarterly research & development expenses
Quarterly research and development expenses of Facebook 2016-2018

The following table shows the quarterly research and development expenses of Facebook Inc.
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Facebook is a leading social media network that has around 2.2 Billion monthly users. Apart from facebook.com, the social networking giant also owns Facebook, Instagram, WhatsApp, Messenger and Oculus. The brand generates substantially all of its revenue from advertising.
The social media brand invests heavily in research and development. Its R&D expenses in 2017 equalled 2,657 millions which was around 600 millions than the same period last year.
Sources:
Facebook Annual Report