Google is facing unprecedented heat in Hong Kong as local authorities attempt to censor a popular pro-democracy anthem -- and the high-stakes spat has provoked speculation that the US tech giant ...

Google's strategy leaves the google.com.hk search engine vulnerable to a total blockade. Facebook, Twitter and YouTube, which is owned by Google, are completely shut out of the mainland.

Facebook, Google and Twitter have reportedly warned the Hong Kong government they would drop services in the territory if data protection law changes take effect.