Bluebulb Projects' The Measure of Things presents:
25 is about 0.00000002 times the number of Users on Facebook
In other words, it's 0.00000001740 times the count of Users on Facebook, and the count of Users on Facebook is 57,500,000 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.