Facebook is testing data mining methods that would silently follow users mouse movements to see not only where we click but where we pause, where we hover and for how long. Ken Rudin, Facebooks analytics chief, told the Wall Street Journal that the social network would have to purchase data pants with a stretchy waistband if it does decide to gorge itself on such data. The problem that remains is how to store and process all the resulting data, he said. Back in 2011, Microsoft researchers looked at how to use cursor movement to understand and improve search results.”]