text: Moved publications in the beginning
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\chapter{Introduction}
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\label{ch:intro}
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\nnfootnote{This chapter was presented at the S{\~a}o Paulo School of Advanced Science on Smart Cities~\cite{katsomallos2016measuring}, as well as during the $11$th International Workshop on Information Search, Integration, and Personalization~\cite{kotzinos2016data} and at the DaQuaTa International Workshop~\cite{kotzinos2017data}.}
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\nnfootnote{This chapter was presented during the $11$th International Workshop on Information Search, Integration, and Personalization~\cite{kotzinos2016data} and at the DaQuaTa International Workshop~\cite{kotzinos2017data}, as well as at the S{\~a}o Paulo School of Advanced Science on Smart Cities~\cite{katsomallos2016measuring}.}
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Data privacy is becoming an increasingly important issue, both at a technical and at a societal level, and introduces various challenges ranging from the way we share and publish data sets to the way we use online and mobile services.
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Personal information, also described as \emph{microdata}, acquired increasing value and are in many cases used as the `currency'~\cite{economist2016data} to pay for access to various services, i.e.,~users are asked to exchange their personal information with the service provided.
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