1. Wang Y. More people have cell phones than toilets, UN study shows. Time (2015). http://newsfeed.time.com/2013/03/25/more-people-have-cell-phones-than-toilets-u-n-study-shows/ . Accessed 18 March 2015.
2. Rodriquez R. 60% of world’s population still won’t have Internet by the end of 2014. LA Times (2015). http://www.latimes.com/business/technology/la-fi-tn-60-world-population-3-billion-internet-2014-20140507-story.html . Accessed 18 March 2015.
3. Smartphone users worldwide will total 1.75 billion in 2014. eMarketer (2015). http://www.emarketer.com/Article/Smartphone-Users-Worldwide-Will-Total-175-Billion-2014/1010536 . Accessed 18 March 2015.
4. 2 billion consumers worldwide to get smart(phones) by 2016. eMarketer (2015). http://www.emarketer.com/Article/2-Billion-Consumers-Worldwide-Smartphones-by-2016/1011694 . Accessed 18 March 2015.
5. Shontell A. Products don’t become interesting until they have 1 billion users, Mark Zuckerberg says. Business Insider (2015). http://www.businessinsider.com/zuckerberg-products-need-1-billion-users-2014-10 . Accessed 18 March 2015.