I think that may have been true in the earlier days of the net. The information was there, you just had to take the initiative to look for it.

Nowadays, aggregators (like HN) and websites like Wikipedia have insane amounts of varying knowledge on many topics which are packed tightly together. We often click on that stray link which may lead us to future immersion into a topic or, more commonly, a quick skim of an article.

The result is knowing little about a lot of different things. While the latter graph may still Internet users, the large gaps should be filled instead by many little bars.