How far down the page people are scrolling. What interests them the most? The brighter the blue color on this module means more eyes are viewing that section of the page. So, if most of a page is dark blue, that means people aren’t reading too far into it – a sign that you need better content on that page. Or, if all of it’s light blue, that’s a great article that deserves a lot of attention – link it, tweet about it, go crazy!