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Opinion mining (also called sentiment analysis) is the analysis of feelings from dematerialised textual sources on large amounts of data (big data).

This process appeared at the beginning of the 2000s and is becoming increasingly successful due to the abundance of data from social networks, particularly those provided by Twitter.

The objective of opinion mining is to analyse a large amount of data in order to deduce the different feelings expressed in it. The extracted feelings can then be used to produce statistics on the general feelings of a community.

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