perhaps one way to sustain interest is via entertainment. those little quick 15 second hits that people like, and less the long form ones, even though arguably the latter ones are much more important. but in this day and age, people simply prefer to spend an hour staring at their facebook feeds rather than reading a good book. there are certainly some interesting articles being shared, but it's not exactly the focus.
so maybe, there is a more intimate link between these things and entertainment afterall.