That's a good point. But for all practical purposes, Facebook, Reddit, and other major social networks represent what the web means to an average person. Many of them never even open a browser. So those major social networks should be treated more like a public square, for the discoverability that provides, if nothing else. And in the context of sites being delisted and apps being banned (Google, Apple, etc), it would be nice for major social networks to be committed to free speech on their platforms.