此贴必删,删前留名 (cǐ tiē bì shàn, shàn qián liúmíng): this post must be deleted; before it is deleted please leave your name
A note frequently left on the comment section of a web page. It shows the commenter's support of content that is susceptible to being deleted by web censors.
A Weibo user leaves a comment for a post that she suspected would be removed—which, indeed, it was.