Probably how many people clicked on what url. There are probably some information about those, the more trivial would be from where in the world they are and how they got there (following a link, being redirected or having entered it manually)

More complicated stats would include estimated age, gender etc, if available

Despite that, I have and will donate to Wikipedia and the Wikimedia foundation, because they host knowledge and quite a lot of pictures. And I love it.

That looks cool

If you have the need to nest 5 levels of for-loops, I suggest taking a step back and rethinking your approach, my friend.

Even if that other approach is just refactoring it into separate methods.