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This paper addresses the main motives of Web 2.0 that have contributed to its commercial success. Among the critical topics the question of amateurism is of pivotal interest. The second part of the paper deals with library use of Web 2.0, stressing that the concept of the Library 2.0 has to be properly understood. Last but not least, literacies expedient in the era of the Web 2.0 are identified.