«WhatsApp users get the message». Financial Times. 2011 թ․ նոյեմբերի 14. «WhatsApp Messenger, an app which allows unlimited free text-messaging between users, has done to SMS on mobile phones what Skype did to international calling on landlines. ... Since launching in July 2009, WhatsApp has slowly grown by word-of-mouth and the same simple viral mechanism that fuelled Skype: both sender and receiver must own the app.»
