参考：仮想通貨 - Wikipedia　：仮想通貨 チャート一覧 :　 ビットコイン - Wikipedia
         : GACKTコインと呼ばれる仮想通貨「スピンドル」が日本撤退

Do you think Bitcoin could become a new global currency?

Are you for or against virtual currency?

What do you think about students who earned huge amount of money by inevesting in Bitcoin?

Do you want to ivest in virtual currency?