Based on my calculations, Facebook has more DC space/power than Google/Amazon/Microsoft. They have around 40 million sq ft of DC space, and likely ~5GW of power. They have 48 buildings in 18 locations, with 47 more under construction.

AWS Data centers are fairly small, ~180,000 sq ft or so generally, us-east-2 is about 900,000 sq ft. us-east-1 perhaps 8 million sq ft.

Google likely has more network capacity, but FB is catching up.