The University of California, Davis has circulated a China travel warning to some of its students, advising them not to use messaging apps like WhatsApp or WeChat or make “unfavourable political statements or postings on social media” while there. It was delivered on Monday in an email sent by Gary Leonard, the University of California Office of the President’s director of liability and property programmes, to the universities that fall under his office’s governance, and was forwarded to people who may be travelling on behalf of UC Davis, a spokeswoman for UC Davis said. Screenshots of the advice have been seen by the South China Morning Post.