I suppose it's because I see reddit and facebook as a weird form of escapism from reality. I know that when I don't have any pressing issues I'm much more likely to sit down and read. reddit/hn is for when I need a quick "don't think about work" break, never for when I have the whole weekend stretching out in front of me.
The utopian dream of Star Trek is a never-ending weekend where _you_ get to decide what's important without being overly concerned that you'll starve to death on Monday.