I think it helped a lot. I still think it's a lot better than Twitter, but it's difficult to compare, because the default-public behavior of Twitter content makes it far more toxic; to find the same stuff on FB you either have to be in a private group, or read public comments on a public article. It doesn't come to you in the same way it does on Twitter.

Most of the horribly content on Facebook is fake accounts, which you can usually identify because their entire profile is around a theme. Facebook tried to make fake accounts impossible for awhile, but apparently they've given up.

Twitter doesn't try.