Bluebulb Projects' The Measure of Things presents:
13,000 is about one-one-hundred-thousandth the number of Users on Facebook.
In other words, it's 0.000009030 times the count of Users on Facebook, and the count of Users on Facebook is 111,000 times that amount.
(March, 2015 figures) (monthly active users)
Facebook had 1.44 billion active users for the month ending March, 2015. In August, 2014, Facebook began a process of removing 87 million accounts that it had found to be fake.