Published on Aug 30, 2018
"The "Momo Challenge" relies on threats to get people to perform tasks.
Targeting teenagers, "Momo" relies on Whatsapp messages to convince
potential "players" to use their mobile phone to contact one of several
"Momo account" phone numbers. Whoever has set up the account then
repeatedly threatens the user to make personal information public ." "WhatsApp is encouraging its users to block phone numbers related to the Momo Challenge and to report them to the company" - wikipedia