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Stack Exchange solves to a good extent the use cases:
  • I have a very specific question, type it on Google, find top answers
  • I have an answer, and I put it here because it has a much greater chance of being found due to the larger PageRank than my personal web page will ever have
points of view. It is a big open question if we can actually substantially improve it.
Major shortcoming are mentioned at idiotic Stack Overflow policies:

Ancestors