This happens on both sides, but only one side gets consistently punished. Punish them all!

Not just in America. There is horrible shit being posted on social platforms in other languages as well. Antisemitism, extremism...

FB et al. do not care, as long as they make money and gain important friends.

I remember recently the Iran ayatollah promoted wiping out Israel on Twitter and nothing happened. Jack Dorsey dismissed it as "saber rattling" from a country that routinely helps terrorists attack and kill Israelis. I guess that is not as bad as Trump claiming election fraud...

Another example, Spike Lee tried to dox Zimmerman on Twitter, but ended up posting the address of some entirely unrelated couple who received death threats. Again, nothing happened.

Iran is already sanctioned, and is this the “remove the Zionist regime from the pages of time” quote?

Yes, that's the one. Probably ignored because it doesn't have any harmful implications.