What are the common challenges with which sentiment analysis deals

What are the common challenges with which sentiment analysis deals? What are the most popular application areas for sentiment analysis? Why?
Note: The first post should be made by Wednesday 11:59 p.m., EST. I am looking for active engagement in the discussion. Please engage early and often.

"Place Your Order Now And Our Professional Writers Will work on It And Deliver A perfect Paper Within The Deadline

Order Now