RedNote’s rising popularity is not guaranteed to last though.

There is no reason to assume it won’t face blowback for the same reasons as TikTok: concerns that it could be used by China to spy on Americans.

It’s unclear how long Beijing would be open to such unfettered exchanges – control of the internet is key to its repressive regime.

The irony of the situation was flagged by one Chinese user, who posted: “Don’t we have a (fire)wall? How come so many foreigners can enter, when clearly I can’t leave?”

Typically, Chinese internet users have been unable to directly interact with foreigners. Global platforms like Twitter and Instagram and search engines like Google are blocked in China, though people use VPNs to circumvent these restrictions. Sensitive topics – from history to dissent – or anything seen as critical of China’s government and ruling Communist party is swiftly censored.

It’s unclear how much RedNote is censored – it’s largely used by younger and middle-aged women in China, where they share images and videos. It’s not like Weibo, another Chinese app, where discussions and airing of grievances is far more common, leading to posts often being taken down.

But a handful of new RedNote users say they have already received reports that their posts have violated guidelines, including one who asked in a post if the app was “LGBT friendly”.

Another said they had asked “What [sic] Chinese think about gay people?” and received a similar notification, that they had violated “public moral order” guidelines.

And Chinese users keep reminding Americans on the app “not to mention sensitive topics, such as politics, religion and drugs”.

One Chinese user also advised them to stick to the “One China policy”, the diplomatic pillar of the US-China relationship – according to which the US recognises and has formal ties with China rather than Taiwan, the self-governed island Beijing claims as its own.