XKCD is rarely wrong, but this:
— this is wrong. During that nine nine hours and fourteen minutes you will not do anything to “slightly improve your knowledge.” You will, instead, gradually become less knowledgeable; any genuine information you might happen on will be methodically and inexorably displaced by misinformation, deliberate twisting of the facts, rumor-mongering, hate-mongering, fear-mongering, and brazenly dishonest personal attacks on anyone and everyone.
If you have any concern whatsoever for acquiring knowledge, you won’t be on social media at all for the next month. It’s as simple as that.