there is a twitter app (twitlonger) where you can tweet more than 140 characters. it just sends a link to your twitter followers, but yeah anyway, she's not even using that. she's just sending out multiple tweets.
you can say so much more by tweeting in Japanese. since kanji can shorten the character count. and spaces count on Twitter too.
ex) 私は本を読んでいます。 (11 characters)
I am reading a book. (20 characters)
anyway, the song preview sounds interesting. can't wait for the full version.