Why don't Stack Overflow, Wikipedia or MSDN etc. include keyword and description meta tags in their page headers?
For example Google indexes the first paragraph as a brief description. Is this a technical point in web design and SEO?
Why don't Stack Overflow, Wikipedia or MSDN etc. include keyword and description meta tags in their page headers?
For example Google indexes the first paragraph as a brief description. Is this a technical point in web design and SEO?
Meta Keywords are no longer used for any purpose by any of the large and most of the smaller search engines.
Meta Descriptions are only good to display a snippet of text that summarizes the content on the page when displaying it in the search results, it has very little if any SEO standing.
Most of the sites you listed (stackoverflow, wikipedia, etc), the content that appears near the top of the page serves as the best summary, therefore it's not necessary to include (and maintain) an additional Meta Description tag for each and every page.