While recent research has advanced our understanding about the structure and dynamics of social tagging systems, we know little about (i) the underlying motivations for tagging (why users tag), and (ii) how they influence the properties of resulting tags and folksonomies. My work tries to analyze the aims users have when they use such systems. To this purpose I introduce two vastly different types of tagging motivation and corresponding measures and detection measures. Subsequently I give an overview of implications on the structure of social tagging systems. Finally I sketch other types of tagging motivation and illustrate potential methods to differentiate them.

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