We have websites with multilingual content. e.g. http://www.example.com/about-us/ http://www.example.com/en-HK/about-us/ http://www.example.com/en-GB/about-us/ ...
Google Webmaster Tools advised the following to us: We have noticed that on a number of the pages on your site the rel-alternate-hreflang implementation is incorrect. In particular, there ...