The development of Internet technologies and personalized advertising has amplified public concern about privacy, but there is little empirical analysis of how firms exploit personal data. This article investigates how website performance, measured by web audience, is affected by intrusions into...

The article studies the intensity of usage of VoIP, analysing individual data on a sample of UK consumers collected by OFCOM in 2006. In particular, it examines the role of firms' strategies in affecting the intensity of usage and the degree of substitution/complementarity between VoIP and other...