With the average American now spending 40 minutes on Facebook per day [0], it may be worth checking out this TedX talk: Distracted? Let's make technology that helps us spend our time well | Tristan Harris [1] (he speaks of a good design example at 4:00 in). It's astounding that this average means that roughly an entire day is wasted each month essentially scrolling through a newsfeed.
Exactly, I'm confused by all these statistics of 'x minutes of facebook per day'. We can't measure other unproductive activities that ALL humans indulge in, it's not as if society will suddenly start producing PhDs by the dozen if we ban Facebook.
[0] http://www.businessinsider.com/facebook-monthly-average-time... [1] https://www.youtube.com/watch?v=jT5rRh9AZf4