I hate to stray into politics but my scary ideas revolve around public policy and the various actions people undertake in the public sphere that affect it. More specifically: Is it possible, by providing better tools for publishing and accessing information, to substantially improve public policy debates? Can we reduce the very large rewards for dishonesty and the use of disinformation?
This is the crux of the problem with our current political system, I think. It's not campaign finance, it's not religion, it's not disagreements about economics, foreign policy, security vs liberty (a lovely false dichotomy) or what have you. It is simply the fact that lies win and truth loses. Or, if that statement is not necessarily true, it is true in the current practice.
So, if you buy my premise, how can technology help? Isn't it a problem of human nature? You can't force people to be honest. You also can't force people to learn how to recognize dishonesty in spheres where they have not much competence. You can't impose good sense or decency.
But human nature is varied, and so maybe the seeming ascendancy of its more unfortunate aspects is situational. Maybe by improving the context and presentation of information they can be mitigated. Maybe technology can be used to recognize and reward honesty and to point out and discourage dishonesty. It hurts to think about, doesn't it? It does for me, because it is so hard, and that's what I took from pg essay. Granted, I may not be talking about problems to solve which would make you the next Google.
As an aside, I think that the utility of greater transparency of public actions (governmental or corporate) is already well-understood by many and much work is already being done in this direction so I am leaving out. But that doesn't mean there isn't room for new solutions there, as well.