Canonical tag for mobile subdomain at WordPress

Some of my clients have  mobile version of website. With one of them  I found terrible issue – they got lot’s of duplicated content because of incorrect canonical tags. So for  instance yahoo.com and m.yahoo.com, it obvious that that the content will be the same but the design for m.yahoo.com will be optimized for mobile platforms. It’s nothing wrong in term of IT, but it’s suicide for SEO approach. Continue reading