Yes, WhatsApp is big in España.
The news that you could tell when your message had been recieved caused quite a stir in the press recently. El doble check azul (blue double tick) has caused quite a polemic. Here are a selection of articles you might find interesting... and another cartoon from one of my favourite dibujantes (J.M. Nieto, from the ABC newspaper) poking fun.
If you enjoyed this resource, you might enjoy reading about my life here in Spain as an immersion teacher of a class of primary children. Zen Kyu Maestro: An English Teacher´s Spanish Adventure is published as an eBook by Monday Books. There´s a free sample chapter available to download here: Zen Kyu Maestro