what companies use Data Mining?

Question

data mining is The automatic extraction of useful, often previously unknown information from large databases or data sets

Answer 1

Many of the large, often times obscure marketing and research companies use this method.
The bad part is they turn around and sell this aquired information to others, I repeat they SELL your information to others.
As you have already figured it's not right but you don't have the ability to put a stop to it.
Don