A question for those who have chosen to add internationalization to their apps:<p>When did you decide to internationalize your app and what led to your decision? Was it a matter of watching analytics and seeing a spike in people coming from new countries that didn't speak English? Or was it more of an effort to reach new markets?<p>Also, what, if any, cultural challenges did you face beyond adding new language support? For example, I live in Japan and when Twitter was aggressively pursuing the Japanese market, they found that people here didn't use SMS (everyone's phone has email), so they changed things up a bit. And though Facebook is aggressively expanding in the land of the rising sun (recently announced a Mixi--a top Japanese SN--data exporter), their attitude towards privacy might be a big deal breaker amongst a lot of potential Japanese users.<p>What has been your experience?