I quite frequently see old questions reappear on the front page of TeX questions, under which it says "modified Xm ago". Here's a current example:
But when I look at the question, in this case An Error with XeLaTeX and fontspec, I can't see any new activity whatsoever. I see this quite often (in this case it says it was modified by 'Community', but it often has a user's name there as well).
Can someone explain what's going on here?