Depends what they want to claim to be. If they write, or if they orchestrate an ongoing discussion so that they de facto decide what is said, then they are "speaking".
They can do that, but not while claiming to be a platform.
This is completely wrong. There is no distinction between platform or publisher in Section 230, no matter how often people repeat this ridiculous take.
Depending on how people see Big Tech, the law may or may not be changed. And the kinds of arguments FB, et al., make to defeat this law will affect how people see Big Tech.
Sure, but people are currently making lots of comments thinking the law, as written, makes some distinction between publishers and platforms. Which it doesn’t.
They can do that, but not while claiming to be a platform.
Platform or publisher.