1. Amazon's "information company": If the world which company from the big data to discover the greatest value, so far, the answer may not be Amazon. Amazon also has to deal with huge amounts of data, and the direct value of this transaction data is even greater.

As an "information company," Amazon not only gets information from each user's purchases, but also records everything each user does on its site

2. Google's intentions: If there's one tech company that has accurately defined the concept of "big data," it's the one that has. If there's one tech company that accurately defines the concept of "big data," it's Google. In March 2012 alone, Google processed 12.2 billion search terms, according to search research firm comScore. Google's volume and size give it more ways to apply big data than most other businesses.

3. Target's "data correlation mining": Using advanced statistical methods, merchants can analyze a user's purchase history to build a model that predicts future purchasing behavior, and then design promotions and personalized services to avoid losing users to other competitors.