The social network may start collecting data on minute user interactions with its content, such as how long a user’s cursor hovers over a certain part of its website, or whether a user’s newsfeed is visible at a given moment on the screen of his or her mobile phone, Facebook analytics chief Ken Rudin said Tuesday during an interview.

via Facebook Considers Vast Increase in Data Collection – Digits – WSJ.

As the head of analytics, Mr. Rudin is preparing the company’s infrastructure for a massive increase in the volume of its data.