How should I structure my urls for both SEO and localization?
I want to have my site available in several different languages. I've seen some sites that use country code top level domains (jp.blah.com), some include the language in the URL ( blah.com/jp/questions ), and some don't even include the language in the URL and just use the browsers locality setting or cookies to determine the language to be displayed. What are the pros and cons of each approach? Are there any techniques that I missed?