Facebook deleted nearly 1.3bn fake accounts in 6 months

"Facebook disabled nearly 1.3 billion “fake” accounts over the past two quarters, many of them bots “with the intent of spreading spam or conducting illicit activities such as scams,” the company said on Monday.
Facebook disabled 583 million accounts in Q1 2018, down from 694 million accounts in Q4 of last year, a decrease the company attributes to its “variability of our detection technology’s ability to find and flag them.”
Most of the accounts “were disabled within minutes of registration,” Facebook claimed in a blog post, but Facebook doesn’t catch all fake accounts. The company estimates that 3 percent to 4 percent of its monthly active users are “fake,” up from 2 percent to 3 percent in Q3 of 2017, according to filings documents.
Those numbers are big, a reminder of what Facebook is up against just 18 months after it was learned that a Russian troll farm used Facebook to try and influence the 2016 U.S. presidential election.
Facebook says it finds most of the accounts on its own using software algorithms, but a small percentage — about 1.5 percent of the disabled accounts — were discovered after they were flagged by Facebook."
Source:  Recode, 15th May 2018
Note - This seems to be just on Facebook, and not on Instagram or WhatsApp (it's only Facebook that insists on a real identity)