Frankly, this couldn't be more wrong. Every website in that list has plenty of semantic structure that is lost in the HTML.
- Facebook, Twitter, Linkedin and Wordpress (not to mention HN) has plenty of structure that could be surfaced by SIOC[1].
- Wikipedia is the king - see DBpedia[2].
- Amazon (and to a lesser extent, eBay) are a perfect fit for Good Relations[3], which is already used by Very Big websites to provide value to customers.
The problem with this post is that reduces the Semantic Structure movement to HTML5. Yes, HTML5 semantic tags may not be worth it, but there's much more to the semantic web technologies than that.
[1]: http://sioc-project.org/ [2]: http://dbpedia.org/ [3]: http://www.heppnetz.de/projects/goodrelations/
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