Will WhatsApp plug the revenue hole for Facebook?

Considering that the number of active social media users in Europe is up 8% since last year, it is difficult to understand the recent drop in users from two of giants within the social media world. Adding further woes to an already excruciating year, Facebook dropped a staggering $120bn in market price after publishing a report which showed a drop of almost 3 million users in Europe alone.
Luckily for Facebook, they weren’t alone in their decline. Twitter also suffered a loss, dropping 27%