Facebook & Data Research - Geek out :)
Big Data & Research
William H asked for this list, but it's useful if you like to geek out on Data Research, Big Data and Facebook.
Facebook Data Research https://www.facebook.com/data
Facebook Research https://research.fb.com/
Facebook Analog lab :) https://www.facebook.com/analoglab
Journalists - implemented (Signal) https://signal.fb.com/
Worth a Read: Trump & Facebook App survey
Mark Zuckerberg (Follow only) https://www.facebook.com/zuck
This is a list of both Big Data/Data Research Facebook Pages (and some external links) as well as Engineering and general developer sites for Facebook (mostly)
LinkedIn Research https://engineering.linkedin.com/
Hadoop & Case Studies https://www.mapr.com/resources/customer-case-studi...
Woolworths & Quantium article http://www.afr.com/business/retail/woolworths-sitt...
Data Infrastructure at IFTTT https://medium.com/engineering-at-ifttt/data-infra...
Facebook's Data Centres
Facebook for Developers F8 https://www.facebook.com/FacebookforDevelopers/
Facebook Engineering https://www.facebook.com/Engineering
Facebook Hackercup https://www.facebook.com/hackercup/
MySQL at Facebook https://www.facebook.com/MySQLatFacebook/