The genocide in Myanmar has both state-sponsored and spontaneous characteristics. Facebook can and should help with the latter, if it's going to allow folks to pass around pro-genocide messaging using the site.
In the end, I advocate for everyone to abandon all large-scale, centralized, corporate social media, but given how unrealistic this goal is at present, my next hope is for the large social media companies to assume more responsibility for their actions. The same standards that we've traditionally held all media companies to.