Are Weibo and Xiaohongshu used widely outside of China? Given the names alone I'd imagine their adoption is fairly limited to China.
Xiaohingshu is widely used outside China... by Chinese.
My experience in the UK is that the whole Chinese community is on it for anything (discussions, classifieds...) instead of Facebook, Insta, etc.
Yeah, if "widely used" means that multiple nations and cultures use the service, then they are not widely used.
Xiaohongshu is generally known as RedNote outside of China.