Really? This is how much of the web works nowadays.
That loverly page you're looking at is built based on initial HTML and then modifications to the DOM (Document Object Model). Each mouse movement/click can cause elements in the DOM to be activated. Each activation may need to phone home to get the proper content to display.
Watching how long some bloke hovers his (or her) mouse over a particularly attractive part of someone's anatomy may get recorded, but "Only for improving our website and performance."
Biting the hand that feeds IT
