1. A method of a system having a processor, comprising: performing sentiment analysis of user feedback using a plurality of uncertainty rules; determining levels of uncertainty associated with sentiment results of the sentiment analysis, wherein the sentiment results identify user sentiments contained in the user feedback; and providing at least one visualization of the sentiment results, wherein the visualization has first visual indicators to represent respective user sentiments, and second visual indicators associated with the first visual indicators to represent respective levels of uncertainty associated with the corresponding user sentiments.