Yes. But GP's comment was about the US government, not restrictions placed on content by American companies voluntarily (or due to pressure from the broader US culture). I agree, of course, the US culture is restrictive in some ways, and this can come through in the practices of US companies (the culture is also quite permissive in some ways). But this is different in important ways from the restrictions being imposed by the government.

Aren't those mainly hidden behind gag orders though? Isn't that enough proof? We can't even tell what was censored presumably for our safety.

Don't think so. We know that there are some allegedly national-security-related takedowns where the government has sought gag orders. We know about them because the companies sometimes object, and the request becomes public. Then there the other types of content being discussed in this thread such as LGBTQ content, adult material, etc. where I don't think there is any reason at all to believe that gag orders would be involved.

> Pretty much all hate speech is censored on social media platforms. So is calling for or promoting violence against certain groups. Harrassment is also prohibited on Facebook, Instagram and Twitter.

Social media platforms censor more than that. Try posting a picture of a nipple on Facebook.