How important is it to canonicalize mobile URLs to desktop URLs?
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I know many SEO's prefer a stylesheet and single URL, but if you use m.domain.com, do you canonicalize to your desktop URLS?
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I would block m.domain.com from all crawlers except Googlebot-Mobile. At the same time, I would block domain.com from Googlebot-Mobile.
I hope that helps.
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Matt Cutts - http://www.youtube.com/watch?v=mY9h3G8Lv4k
To kind of summarize, Google has normal bot and mobile bot. So long as you're serving up data consistently you should be fine.
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