BMF.io publishers don't just look at who clicks on a page , they wanna know if people are actually into it. So they check how long you stick around, how far you scroll, what you tap on, all that stuff. They use heatmaps to see where your eyes (and mouse) go, and they keep an eye on things like if you comment, share, or come back later. If there's a video, they'll see if you watched the whole thing or dipped out early.