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WikiPedia: WhatsApp http://www.alexa.com/siteinfo/whatsapp.com http://elpais.com/elpais/2012/07/09/inenglish/1341... http://www.forbes.com/sites/ericjackson/2012/12/03... http://whatsapp.com http://www.whatsapp.com/ http://www.whatsapp.com https://www.fastcompany.com/3026758/inside-erlang-... https://www.whatsapp.com/ https://www.wired.com/2015/09/whatsapp-serves-900-... https://commons.wikimedia.org/wiki/Category:WhatsA...