<http://schema.org/thumbnailUrl>
<http://s.glbimg.com/po/tt2/f/original/2015/04/24/whatsappweb4.jpg>
<http://www.techtudo.com.br/artigos/noticia/2013/04/confira-dicas-e-truques-para-usar-o-whatsapp-e-obtenha-o-maximo-do-app.html>