Comment by matheusmoreira

Brazil.

Here are some sources for the event I described:

https://techcrunch.com/2016/07/19/whatsapp-blocked-in-brazil...

https://theintercept.com/2016/05/02/whatsapp-used-by-100-mil...

https://www.theguardian.com/world/2016/jul/19/whatsapp-ban-b...

https://www.forbes.com/sites/parmyolson/2015/12/17/zuckerber...