https://www.reuters.com/article/us-china-facebook-subsidiary/facebook-plans-innovation-hub-in-china-despite-tightening-censorship-idUSKBN1KE1JF >Facebook has set up a subsidiary in China and plans to create an "innovation hub" to support local start-ups and developers, the social media company said on Tuesday, ramping up its presence in the restrictive market where its social media sites remain blocked.