That's true, but FB is not a "community" -- its a global mass mob consiting of billions of people. Even thinking about trying to moderate something at that scale is ridiculously impossible and disengenuous.
I think to this person's point, though – managing something like an online community is a microcosm of what social media platforms deal with, and if you've done it before you know how hard it can be to set the boundaries of acceptable behavior without finding yourself in spot that is viewed as hypocritical.
I can't think of anything harder than that to scale.
There are over two billion people on there. How about paying their users for finding and reporting content? A reputation system to find and pay trustworthy people to clean up. Thereby delegating the task back to the scale where it belongs, some money and incentives too.
I've been thinking about a online bounty hunter service to do exactly this.
Next step - how to prevent Sybil accounts created by the bounty hunters from generating new mal-content on an industrial scale for bounty hunters to identify for reward.
"Move fast and break things" is all well and good until you build something so big, so pervasive, and so dangerous that you can't fix it without turning it off completely.