What Centiare uses
To answer the above question, Centiare is using MediaWiki, but a special implementation of it called "Semantic MediaWiki". Our theory (none of the principals of the project is an SEO expert) is that our use of semantic tagging in the articles (which creates these lovely RDF tables) and our encouragement of Google AdSense ads being deployed by our users (you figure Google's got to favor a site with their ads over an equally-notable site without their ads), are what help propel our directory listings to top spots on Google.
I'm afraid to say much more, because I just got a 6-month ban over on the DigitalPoint forum, just for accepting a "keyword challenge" that would help to prove or disprove whether Centiare can actually work in "commonly used" keyword searches. (They were not impressed with my couple of examples thus far.)
Greg
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