Now Twitter comes with the banner ads in the upper right corner when you use IE from Japan IP address (presumably).
This is a great experiment for twitter how the banner ads work. However, I personally don’t like it makes it Japanese UI whenever it finds the user from Japanese IP address (which is quite common practice though). The same exact mistake google makes.
Update: They allow you t0 choose language in the settings. When you choose English, Japanese UI and banner both disappeared,which is nice.