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With the rise of Web 2.0 paradigm new trends in Information Retrieval (IR) and Information Extraction (IE) can be observed. Significance of IR and IE as fundamental method of acquiring new and up-to-date information is crucial for efficient decision making. Social aspects of modern information retrieval are gaining on its importance over technical aspects. The main reason for this trend is that IR and IE services are becoming more and more widely available to end users that are not information professionals but regular users. Also new methods that rely primarily on user interaction and communication show similar success in IR and IE tasks.
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