Social media measurement company Semiocast has released a study about how Twitter is growing the fastest in Asia now in terms of the number of posts. In North America, Twitter posts have declined about 7% in the last three months and posts have increased in Asia by about 5.5% during the same time period. Now 37% of Twitter posts are sent from Asia. The U.S. accounts for 25% of Twitter posts sent out, down from about 30% in March. Japan accounts for 18% and Indonesia accounts for 12%. Below are some charts from the study.