We started a successful site generating lots of organic traffic. We already localized to English, German, Spanish and Chinese. Which language should be the next in your opinion (regarding highest reach combined with strong Internet usage and purchasing power)?
I have no stats regarding "purchasing power" but looking at List of languages by number of native speakers[1], the obvious candidates would be French, Portuguese and Arabic<p>[1] <a href="http://en.wikipedia.org/wiki/List_of_languages_by_number_of_native_speakers" rel="nofollow">http://en.wikipedia.org/wiki/List_of_languages_by_number_of_...</a>