If you want to have idea of how you are particularly favourably or unfavourably a brand/person/object, you can enter this free service called Tweetfeel.
It will be displayed in red, the tweets that have bad characteristics, and in green those positively evaluate your topic. It will generate a statistical percentage of positive and negative, which will be very entertaining being observing how it is changing.
The service is free, although there is an improved version for companies that need to track all tweets. Enter, type the subject to be discuss, and you will have statistics, although somewhat rudimentary, of what they say on Twitter about a topic.