On: New example of rare Etruscan writing found

[coderdude]

This made me want to Google 'Japanese entropy bits' and the first hit for me was this paper: http://www.phontron.com/paper/neubig13sam.pdf

"How Much is Said in a Tweet? A Multilingual, Information-theoretic Perspective"

I think what you want is presented in a figure on page 6.

[FroshKiller → coderdude]

So while Japanese tweeters could express more than English tweeters in the same character count, they generally don't choose to. That's pretty interesting.