This article calls into question how closely you feel a sitting executive's campaign is to its government, but we have heard about it.
https://www.theatlantic.com/magazine/archive/2020/03/the-202...
https://www.theatlantic.com/magazine/archive/2020/03/the-202...
If the US government were using Facebook to censor and disseminate propaganda, we'd likely eventually hear about it.
In contrast, the Chinese government is certainly using TikTok to censor and quite likely to disseminate propaganda. Critics of that policy will be imprisoned.