Beijing appears to have blocked access to the social network on the Chinese mainland as it seeks to restrict the flow of images from pro-democracy demonstrations.
As the pro-democracy demonstrations continue, many protesters have begun using FireChat, a free app that allows users to communicate even without a mobile phone signal.
The debate, which centres on the introduction of Internet fast lanes, at extra cost, for high-bandwidth services, was also subject to an online slowdown protest last week from Netflix and Twitter.
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