China has aggressively stirred up anti-Western and nationalist sentiment using state and social media as part of an information war in the Hong Kong protests.

On Monday, Facebook and Twitter said they had discovered and taken down networks of accounts that had originated in mainland China, where both social networks are blocked. The accounts had posted that the Hong Kong protesters were acting violently and accused them of ulterior motives. One Facebook post likened the protesters to Islamic State fighters.

The takedowns of the China-linked accounts mark an escalation in the global disinformation wars. In 2015 and 2016, Russia pioneered