Last week, well-known content creator Hu Chenfeng had his social media accounts scrubbed of all posts. No-one knows why because Chinese officials gave no explanation. But it's widely believed that this was in response to a viral comment that he had recently made, classifying people and items as either "Apple" or "Android" - with the latter used to describe things that are inferior to the former.
"Yours is a typical Android logic, Android person, Android qualification," he rattled off during a livestream that has since been widely shared online.
While the gag was quickly embraced by many Chinese social media users, others accused Hu of sowing social divisions.
Such obvious jokes about inequality, it seems, have become tricky territory - because they reinforce the divides that the Chinese Communist Party would rather people not dwell on.
Censorship is not new to the Chinese internet. Anything that suggests criticism of the Party, its leaders, or touches on controversial topics that have political implications, quickly disappears.
What is unusual about this campaign against pessimism is that it seems to target a range of online behaviour that could create or add to a sense of negativity.

