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Look ..it's the same nonsense as DMOZ.. we dont see DMOZ or Amazon dominating the serps anymore either do we..
DMOZ is a directory of annotated links.
Wikipedia is a vast collection of encyclopedia articles--in other words, of first-hand information, not just links to sites that offer such information.
Two different animals altogether.
Wikipedias entire purpose is for the world to search wikipedia .. rather short sighted of the SE"s to help wiki along.
No, Wikipedia's entire purpose is to supply readers with information on a vast array of topics, in the form of articles with citations. And what's Google's stated mission? "To organize the world's information and make it universally accessible." Given that mission statement, it would be startling if Wikipedia didn't do well in Google Search.
In fact it's not hard to bring up DMOZ pages in Google's results if you try; one reason DMOZ is not as prevalent may be that its title tags are set up non-optimally (the title contains the entire path down to the page).
That's your problem then.
A Wikipedia result may or may not be a good result for a term, but calling it spam is goofy.
It's no coincidence that complaints here have been from someone without an idea of what spam is, and another who didn't know the difference between two of Google's moneymaking enterprises.
Get out of the 20th century. Big, popular websites will rank well in search engines that are based on a PAGE rather than a domain. Wikipedia's one page on a topic surely can't compare with a niche domain with thousands of pages on knitting, but that isn't how engines rank things.
Either build a million page website recognized (rightly or wrongly) by tens of millions of people as an authority, or don't. But the future of the Internet belongs to big, powerful, dominant entities, just like the world does.