Today I read this question:
It had a comment or two from a php-philiac, and I carelessly chose to comment with a link to:
I quickly thought better of it and deleted the comment since, in hindsight, linking to such a question in this context is clearly belligerent. However, coming back later, I noticed that the question to which I linked was still visible in the Linked section on the sidebar to the right (above Related). Just to be sure that I understood the process correctly, I decided to do it again by attacking regular expressions (oh my!):
To wit, I linked to:
Again, I immediately deleted the comment.
As of writing this question, both links still appear on the right hand sidebar. Is there some process that ultimately cleans up these links? Or have I discovered a way to permanently make fun of a question I deride? ;)
(Just kidding, the second one was experimental, but I wouldn't do it intentionally again.)