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?