There are a number of internationalization (i18n) issues with Twitter. I use Twitter directly from a browser. If you use a Twitter client then your experiences could differ from mine. A client could, for instance, reconstruct Unicode Domain Names from a Punycode form. I deliberately use twitter from a browser so that I can determine what is happening at base level. Additionally I do not use any twitter related browser extensions. So now to the i18n twitter issues that I have so far encountered. hashtags If I use an ASCII hashtag then it works as expected. If though I use non ASCII Unicode characters then twitter does not recognize it as a hashtag. eg #loughborough works but #ラフバラ does not. Sina's Microblog 新浪微博, unlike twitter, does have Unicode hashtags. Twitter uses a single # character as a prefix to the text. 新浪微博 uses a pair of # characters to bracket the text. By way of example, #ラフバラ# is a valid Unicode hashtag which I have used on my 新浪微博 weibo.com/andreschappo ラフバラ is loug...