Facebook and Twitter have accused China of using social media to spread disinformation about Hong Kong’s protest movement. This week, the U.S.-based social media services removed accounts they say were linked to a campaign targeting the Hong Kong pro-democracy movement. The Chinese government blocks both Twitter and Facebook on the mainland. The sites are freely available in Hong Kong. Twitter said in a statement it had taken down more than 900 accounts for purposefully attempting to create “political discord” in Hong Kong. The company said it had uncovered evidence the accounts were part of a coordinated state-backed operation. The accounts appeared aimed at “undermining the legitimacy and political positions of the protest movement on the ground,” Twitter added. All the accounts had been “suspended for a range of violations” of Twitter policies.