[insoluble]

A way to sort or filter Web searches (sites, articles, posts, comments) by the IQ and or age of the person who wrote it. This would help people to minimise low-quality content. Even if the person were unknown, heuristic methods could be devised to estimate the level of intellect in a given article or post. There are various obstacles and abuses to be resolved, but it would still be nice to have a feature like this available. At the same time, I imagine that society would not currently accept such a proposition.

[dalerus]

I would take a system that told me the reading level of the article before I click through.

[insoluble]

It's surprising the big search engines don't already do something this simple. Maybe a browser plugin could perform this analysis on blocks of text and append a small div at the upper right/left showing the score for each block. Perhaps it could even use things like misspellings and grammar errors as indicators of poor quality control.