Today, https://mathoverflow.net/questions/28487/is-there-a-concept-equivalent-to-factorial-that-uses-addition-rather-than-multip was on the front page. I was about to flag the question, only to realise that the question was already closed and three years old.
I think it was due to an edit adding a tag. I do not see any reason why the tag should be added, and bumping these questions seems like a bad use of the site. Maybe I am wrong, and there is a good reason why the question should be retagged. Anyway, I thought it was good to have a short discussion on this.