Big_data & metadata is everywhere & more of it is being recorded & sorted every day.
http://phys.org/news/2013-10-schooled-noise-big.html
http://www.techrepublic.com/blog/the-enterprise-cloud/cloud-computing-and-the-rise-of-big-data
http://www.itworld.com/big-data/366825/big-data-metadata-and-traffic-analysis-what-nsa-really-doing
http://www.techterms.com/definition/metadata, http://www.fgdc.gov/metadata
http://www.theguardian.com/technology/interactive/2013/jun/12/what-is-metadata-nsa-surveillance#meta=0000000
http://www.theregister.co.uk/2013/09/30/nsas_project_marina_stores_everyones_metadata_for_up_to_a_year
http://www.theguardian.com/world/2013/sep/30/nsa-americans-metadata-year-documents
http://www.zdnet.com/nsa-stores-metadata-on-innocent-web-users-for-a-year-report-7000021355
http://www.zdnet.com/nsa-fear-of-a-black-van-7000019846
http://www.tamingthebigdatatidalwave.com, http://www-01.ibm.com/software/data/bigdata/use-cases.html