Until now publishing content has had limitations. Now anyone can publish as much content as they want, however irrelevant, and that is becoming a problem: proliferation of irrelevant content (irrelevant from the perspective of the reader). So I think the next challenge is to just be able keep content concise, relevant and affine to your interests. Twitter took a stab at that, but it's not there yet. Having a machine…
That's something I've been casually interested in in the last few months, simply because I have, rather lately, come to understand that I won't ever be able to read all the books I want to read, or see the movies I want to see, etc.
However, it seems to me the "problem" or the situation is a little more complex than that. The information you consume will always be a subset of "reality", and how detached you are from "reality" based on what information you consume seems like a quantity that will be hard to measure.
For the sake of being somewhat contrarian here, I'm just going to repeat something I've mentioned a couple times: I think that contrary to popular belief, all attempts at giving people a more "balanced" view of reality with a balanced "information diet", all attempts at avoiding the "filter bubble" are completely misguided.
The value is precisely in creating bubbles that are as valuable as possible for individuals, by filtering, curating, optimizing the information they consume to maximize the utility they get from it. That possibility seems to me to be largely unexplored today in places where you would expect to see it (information aggregation platforms, recommender systems that are still quite primitive, etc.).