Happy 24th birthday, Ayaka!
By the way, I had some prediction that (based on the popularity of this singer) she would have an official fanclub, and she just opened it up on the day of her birthday.
Now it appears that the layout is based on the Avex fanclub sites (because of Avex distribution of Ayaka's albums), and it costs 4,000 yen per year, plus a 1,000 yen joining fee...
http://fc-astation.jp/ayaka/
(By the way, the website got updated -
http://room-ayaka.jp/)