Here's a staggering fact: 90% of the data in the world has been created in the last 2 years.
http://www-01.ibm.com/software/data/bigdata/
See this NY Times article on what Big Data *can't* do:
http://www.nytimes.com/2013/02/19/opinion/brooks-what-data-cant-do.html?smid=tw-nytdavidbrooks&seid=auto&_r=3&utm_source=buffer&buffer_share=44e24&
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