In my experience, this is pretty uncommon though. I know only a few people that use the web this way, and a lot who browse the front page of reddit, watch whatever videos show up in their FB feed or on the front page of YouTube, etc.
The resources are there, but are they used enough to make my statement regarding what the web is mostly used for invalid? I don't know.
For the month of September 2018, OCW reported 1.09M unique visitors [1]. In their 2017 annual report, Facebook reported 2.13B monthly active users [2]. I suspect the comparisons between coursers, edx, udemy, etc and reddit, Twitter, memes, etc would be similar, and three orders of magnitude seems sufficient to say "most."
If you think your web use is typical, perhaps it is you in the bubble.
[1]: https://ocw.mit.edu/about/site-statistics/monthly-reports/MI... [2]: http://d18rn0p25nwr6d.cloudfront.net/CIK-0001326801/c826def3...