“The number of people accessing Facebook via the ‘Dark Web’ now stands at 1 million per month, the tech giant announced April 22. Facebook has maintained an ‘Onion’ site that resides on the Tor network, which forms part of the so-called Dark Web, for about a year and a half. This is the first time the company has revealed details about its presence in this shadowy corner of the internet.”
Source: A Million People Now Access Facebook on the ‘Dark Web’ Every Month – Nextgov.com