Has Winnie the Pooh done something to anger China's censors? Some mentions of the lovable but dimwitted bear with a weakness for "hunny" have been blocked on Chinese social networks.

Authorities did not explain the clampdown, but the self-described "bear of very little brain" has been used in the past in a meme comparing him to portly Chinese President Xi Jinping.

Posts bearing the image and the Chinese characters for Winnie the Pooh were still permitted on the Twitter-like Weibo platform Monday.

But comments referencing "Little Bear Winnie" - Pooh's Chinese name - turned up error messages saying the user could not proceed because "this content is illegal."

Winnie the Pooh stickers have also been removed from WeChat's official "sticker gallery," but user-generated gifs of the bear are still available on the popular messaging app.

Comparisons between Xi and Pooh first emerged in 2013, after Chinese social media users began circulating a pair of pictures that placed an image of Pooh and his slender tiger friend "Tigger" beside a photograph of Xi walking with then-US President Barack Obama.