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Yeah - ditto here. I tested DCMI on a few sites years ago, and I know folks who've tested more recently. We also looked at meta data of any variety in our correlation/rank analysis in 2009 and saw the engines appear to ignore everything but the known tags - description, robots, etc.

The problem with serving content for different channels is that crawlers read 2 pieces of the same content and can penalize you. There a few workarounds for that.One is obviously the fact that you can add a rel=canonical tag, but if you are serving same content due to only channels, it may pose an issue. Example: if your webpage URL is www.mywebsite.com/abc (which can be accessed via navigational links on your website) and you have a url www.mywebsite.com/xyz which you use for mobiles, PPC or any other channel, but both having the same content, it will cause problems. The way to deal with such issues is adding parameters (campaign id, etc) to 1 URL to tell google that you are using this version of the page(the one with campaign id) for some specific channel. If you are making your website ready for the mobile, the best way is to tackle is to write device detection codes in your htaccess file. It may look something like this: RewriteCond %{HTTP_USER_AGENT} ^.iPad.$ RewriteRule ^(.*)$ http://ipad.mydomain.com [R=301] If you are serving content in different languages, then it shouldnt be much of a problem (generally speaking)

Thank you Greetings واتساب الذهبي.

Thank you Greetings واتساب الذهبي .