Luckily the censorship game in the US is strong, but not that strong. I read a book about propaganda written by someone who wrote it for the US in WW2, and he was able to explicitly state (a chapter or two in) that he only gave examples of axis propaganda in the book because his side's were classified, but to remember that everyone did the same things.

(he did leave for a footnote that for examples of pornographic propaganda one would have to visit archives at an address in Washington DC; guess that'd be the 1950's talking)

If the US is conducting psy-ops on social media against adversaries, wouldn't they use media companies popular in that country? And, if that were Twitter, wouldn't the language barrier still make it relatively harder for Twitter (a company staffed predominantly by English-speaking employees) to investigate?

Additionally, does it merit discriminating between offensive and defensive psy-ops? Might there, for example, be government-controled bots injecting wholesomememes content into the feeds of depressed government employees? Does Twitter have a different obligation in that context?