https://qooah.com/2012/09/21/facebook-messenger-%e8%81%8a%e5%a4%a9%e5%ae%a4%e7%95%8c%e9%9d%a2%e6%9b%b4%e6%96%b0%ef%bc%8c%e6%89%bf%e8%ab%be%e5%b0%87%e6%9c%83%e5%9c%a8%e6%9c%aa%e4%be%86%e6%97%a5%e5%ad%90%e9%80%b2%e8%a1%8c%e5%a4%a7/