Diego Reforgiato, SentiMetrix Inc., USA and University of Catania, Italy

Opinion mining and sentiment analysis
Nowdays, online opinions can make or break a product in the market place. With the wide spread of opinion-rich resources such as personal blogs, online review sites, and social networks, new challenges and opportunities arise as people now can actively use information technologies to seek out and understand the opinions of others. There are numerous applications in which we would like to assess what opinions are being expressed in text documents. For example, Martha Stewart's company may have wished to assess the degree of harshness of news articles about her in the recent past. Likewise, a World Bank official may wish to assess the degree of criticism of a proposed dam in Bangladesh. The ability to gauge opinion on a given topic is therefore of critical interest. This tutorial includes the new challenges appearead in Opinion Mining, some available resources, tools, evaluation datasets and techniques and approaches to determine the attitude of a speaker or a writer with respect to some topic.