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BlackBook was an anonymous 
Darknet
A darknet or dark net is an overlay network within the Internet that can only be accessed with specific software, configurations, or authorization, and often uses a unique customized communication protocol. Two typical darknet types are social n ...
social network. It is known as "the Facebook of Tor
Tor, TOR or ToR may refer to:
Places
* Toronto, Canada
** Toronto Raptors
* Tor, Pallars, a village in Spain
* Tor, former name of Sloviansk, Ukraine, a city
* Mount Tor, Tasmania, Australia, an extinct volcano
* Tor Bay, Devon, England
* Tor ...
."
It is not known how popular BlackBook was. The site was hacked and has not recovered. The site was hacked and disabled multiple times in 2018.
It had features similar to those of Facebook. It had chat, pictures, friend requests, status updates, and groups features. Even the landing page of Facebook was copied. It competed with Facebook Onion and Torbook.
References