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Preface Database is an entity that always applies to a certain fragment of reality (the area of analysis) and constitutes a collection of data, with specified internal structure, which represents said fragment of reality and makes data retaining easier. The description the database’s inner structure is handled by data models, which allow for precise (usually formalised) depiction of the data’s properties,...

Abstract The Web 2.0 revolution spreading over the Internet has dramatically changed the way data is gathered and processed by web applications. The static, authoritarian model of the Web has been abandoned in favor of dynamic, community-driven model of user-generated content. Social networks appear abundantly in all domains of human activity, presenting users with limitless volumes of data, information,...