“What they’re looking out for are key words and expressions popping up in social media. Anything signalling an intention to protest or ridiculing the country’s senior political figures will be blocked and potentially see a user reported to the authorities.
For example, a message featuring the name of this country’s ever-more powerful leader and his sometimes-used nickname ‘Winnie the Pooh’ (小熊维尼) will simply not go through to group discussions on the messaging app WeChat.”
Source: China congress: How authorities censor your thoughts – BBC News
