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Data mining is the analysis step of the "knowledge discovery in databases" process, or KDD. The term is a misnomer, because the goal is the extraction of patterns and knowledge from large amounts of data, not the extraction (mining) of data itself.

Social media is free because there are popup ads, companies will pay social media sites to promote there buissness. So social media makes money wihout charging its customers.

https://en.wikipedia.org/wiki/Data_mining

http://www.anderson.ucla.edu/faculty/jason.frand/teacher/technologies/palace/datamining.htm

http://www.anderson.ucla.edu/faculty/jason.frand/teacher/technologies/palace/datamining.htm

http://www.adweek.com/socialtimes/social-media-is-free-social-media-marketing-is-not/35000

http://www.gcflearnfree.org/socialmedia