title: SEO implications of a multi lingual site with detection of system culture
body: <p>I have developed a multi-lingual site in ASP.NET, which detects the user's system culture, and displays content in the appropriate language.</p>
  
  <p>This is all working nicely, but my client has since had an SEO audit. The SEO agency has expressed a concern that this is not good SEO practice, as there are not unique URLs for each language.</p>
  
  <p>They have suggested that the site may be accused of cloaking, and that google may not index the site correctly for each different language.</p>
  
  <p>Any ideas on whether these are valid concerns, and if there is an advantage to having unique URLs for each language version of the site?</p>