New PM Mark Carney Vows Crackdown on U.S. Platforms—Targets ‘Hate’ Online, But Who Decides?

New Canadian PM Mark Carney announces his plan to crack down on certain "large American online platforms".

"Large American online platforms have become seas of racism, misogyny, antisemitism, islamophobia and hate in all its forms... My government will act."

I wonder which "large American online platforms" he's referring to?