Ask HN: What Is Facebook?

Has it's primary definition been evolving into something more than it was intended to be at the beginning 16 years ago? Is it no longer a purely communication platform? Is it a hybrid news model now? Do you think they should be held responsible for every piece of content that's hosted on their platform by users? Should social media behemoths like facebook and twitter be content cops, is that a more business friendly strategy in 2020? In an ideal world, would that be necessary? Or does this community think they should follow models which prohibit any accountability for content posted by people of importance? But then again, where do you draw the line about who's content are you to moderate? Is facebook going the right way by not following twitter's model regarding posts by the POTUS? What does HN think about this?