There is an increasing growth in the amount of data produced by numerous resources. For example, the Large Hadron Collider (LHC), a particle accelerator, produces 30 petabytes (PB) of data per year (a petabyte is a multiple of the unit byte for digital information equal to a million gigabytes). Data are also generated on the Internet and in social networks.

Daily data production for Facebook is also measured in petabytes. According to Internet Live Stats, Twitter produced more than 450,000 tweets per minute in mid-2017. Internet Live Stats also provides information about the number of Internet users, e-mails, social media posts, blog posts, and other Internet use per minute. Besides textual data published on the Web, multimedia data are tracked, including, for example, the number of ...

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