distinctive calvinist "work ethic" bias in this article. play is more important than work to the average person.
It's not clear to a new user that something as simple as a website could become addictive and begin to take huge amounts of time, concentration and patience away from you. Or even that it could be a bad thing. It seems to catch even disciplined people off guard. But I have noticed that they often self-regulate eventually anyway.
There does seem to be a certain desire to be productive in many people, and so I'm not particularly worried about an entire society totally consumed by social media/entertainment.