the Company is taking three steps after this attack
It was announced that white nationalist and separatist content are being banned by Facebook earlier this week. The company has since removed a number of groups of some organizations from its app and will remove praise of such groups as well.
The final step mentioned in the letter is that the company is providing:
What it means by “exploring restrictions” on live video, the specifications are not yet cleared in the letter. Although it might be a warning to the person if he has previously violated the site’s community standards.