Earlier last year, in April 2018, there was a civil society group in a local innovation centre in Yangon that had been giving close attention to how social media platforms like Facebook had been fuelling government and Buddhist extremist organizations in the spread of hatred among the population and threats against journalists.
This innovation centre sent an open letter to Mark Zuckerberg for his ignorant actions on.... When this local innovation centre reported to Facebook about the Buddhist organizations sending messages to each other through Facebook Messenger to attack Muslim populations across the country, Facebook ignored it. That's why many local organizations came together and asked for action against Facebook.
Right after that, there was Cambridge Analytica. All these problems came together, and Mark Zuckerberg was asked about particular cases on Myanmar's war because of this open letter.