What is Sentiment Analysis:
Sentiment analysis is extremely useful us to gain an overview of the public opinion behind certain topics and feedbacks. Automatically classifying text by sentiment allows you to easily find out the general opinions of people in your area of interest. For example, you might want to analyze reviews of a product to help you improve the customer experience, or to find the most or least popular product.
The Obama used sentiment analysis to gauge public opinion to policy announcements and campaign messages ahead of 2012 presidential election.
How can we get this?