So, August 21, 2015 was a landmark day for Facebook:

One billion people used Facebook on Monday

During just a single day, roughly one out of every seven people on Earth logged in to the social network, says Facebook CEO Mark Zuckerberg.

http://www.cnet.com/news/one-billion-people-log-into-facebook-in-single-day/#ftag=CAD590a51e

“Facebook has reached a new milestone: 1 billion people using the social network in a single day.

Facebook reached the high mark on Monday, CEO Mark Zuckerberg wrote in a Facebook post on Thursday. That means roughly “1 in 7 people on Earth used Facebook to connect with their friends and family” in a single day, he added.”

Stephen