https://qooah.com/2013/02/02/%e6%a5%ad%e7%95%8c%e7%a4%be%e8%a9%95-whatsapp-%e4%ba%8b%e4%bb%b6%e5%a4%9a%e9%9d%a2%e5%88%86%e6%9e%90-%e4%bb%a4%e6%b8%af%e4%ba%ba%e8%92%99%e7%be%9e-%e6%b2%92%e6%9c%89%e4%bf%a1%e7%94%a8%e5%8d%a1/