Since the article doesn't specify what types of professions were studied, thus I am skeptical of its conclusion. While this ~3hr/day productivity might be true for typical corporate/office workers, but they make up only a small percentage of the total work force! What about the productivity of bus drivers, doctors, cooks, masons, mechanics? Somehow I think that the average roofer doesn't spend ~2hrs/work day reading social media and news websites.