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Why do I like Wikipedia? Well, first because of its outstanding quality and extent.
However, Wikipedia is also a particularly good exemplar for "The Next Knowledge Medium", which is a favourite subject of mine. The first knowledge media were "watching", "showing" and "telling", followed by "writing". Then came the internet, facilitating information flow in general, then the web, facilitating knowledge representation (HTML) and access (HTTP and search engines). Now, we have wikis, allowing the nearly limitless quality improvements that I longed for since the beginnings of the web. A future step may be the additional (but not exclusive) machine-processable formalization of some of the represented knowledge. This might help in automated theorem proving and would turn Wikipedia into a Semantic network.