Indeed, I find that aside from there just being too much media to consumer, there's also a factor of available energy. What I notice often happens is that browsing stuff like social media requires less mental effort than reading or even playing a game. So, you kind of just do it mindlessly when you're bored, but then you end up regretting not having spent the time doing something you would've found more meaningful instead. It's an intellectual equivalent of eating fast food instead of having a proper meal.
Yeah that's exactly the case. The effect of social media can't be denied. They call it "cheap dopamine" for the brain, since it's hijacking our attention and behavior, changing our action to concentrate less and getting addicted to it with a flood of information.
Then there are the rotting watermelons over in corner, expensive books that a professor in college required and then almost never used. And now they sit, unlovable and difficult to resell because a new edition has come out with the problems at the back of the chapter rearranged.