Interesting what I found searching the net. This is a system to notify any event from your Raspi to *WhatsApp*.
The tutorials are made to be used with the [FonYou](http://www.fonyou.es) company, but I think it's not difficult to get the same result with other operators.
Link: [myworldraspberrypi > My raspberry Pi sending whatsapps](http://myworldraspberrypi.blogspot.com.es/2013/02/my-raspberry-pi-sending-whatsapps.html)
Spanish Link: [portallinux.es > Notificación de la temperatura de la CPU por WhatsApp](http://portallinux.es/raspberry-pi-notificacion-de-la-temperatura-de-la-cpu-por-whatsapp/)
Spanish Link: [rsppi > Uso de WhatsApp para el envio de notificaciones](http://rsppi.blogspot.com.es/2012/10/uso-de-whatsapp-para-el-envio-de.html)
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