http://tech.firstpost.com/news-analysis/new-app-will-unsend-text-by-deleting-message-from-receivers-phone-260781.html
這是為什麼,老貓很想瞭解事後樓主是如何追到肇事人....(良心說,老貓的直覺是這個故事其實是角色互換....)