I wasn't aware that informing users of a video being a repost was your job. Can't you write something like, "hey, i've seen that video on here before, but its still a good one." Hey, i'll match your "repost police" with "spelling police" and say, "you spelled whether as weather. lets listen to this guy... I'm sorry, is it raining outside? (Perhaps i can give some sort of alert to you, that you can't use whether in the right form, whether or not you take my advice, i've done my job)