WhatsApp刪除訊息可查閱 1:20
https://tw.appledaily.com/new/realtime/20171117/1242659/
https://www.hk01.com/%E5%9C%8B%E9%9A%9B/134208/WhatsApp%E6%92%A4%E5%9B%9E%E5%8A%9F%E8%83%BD%E6%9C%89%E6%BC%8F%E6%B4%9E-%E7%94%A8%E5%AE%B6%E7%99%BC%E7%8F%BE%E8%A8%8A%E6%81%AF%E6%9C%89%E8%BE%A6%E6%B3%95%E7%9D%87%E5%BE%97%E8%BF%94
