If they are a common carrier:
“If your business is to carry things for others, you have certain legal obligations,” she says. Whether you’re a postal service delivering letters or a ferry delivering people, the basic obligation is “to serve upon reasonable request without unreasonable discrimination at a just and reasonable price and with adequate care.”
read:https://ting.com/blog/getting-straight-about-common-carriers-and-title-ii/
If they are a content provider, they are responsible for all content posted on their site.
Right now they are legally straddling the fence and you can’t have it both ways. This action pushes them hard to the side of being a content provider because they are controlling the content. That would mean they are responsible for every nutcase post.
I believe Facebook is making a mistake and will be open for lawsuits.
We are their product.