I'm on Dreamwidth. I have regular conversations with a variety of people who I've known for years, many of whom I have no idea what their real identity is. There is almost no spam, because the site owners take spam seriously, and also because you get total control over what you see.

The past decade has shown that having your name attached to your words online does not reduce toxicity.

If you look you can even find research arriving at the conclusion that non-anonymous posts tend to be more toxic.