[S4M]

I think the very best submissions got something like 2k points. Since those are really interesting, I would assume a significant proportion of the readers upvoted them, let's say 20%. It would mean 10k unique registered visitors a day. I don't know about the non registered visitors, but let's say for the sake of guessing that they are 10k, that would be (very approximately) 20k unique visitors a day.