ICT has enlarged the capabilities of organizations to collect and use citizens' personal data. Although this has allowed for more personalized commercial offers, the use of such data is sometimes controversially excessive or ethically questionable. In this article the author analyzes the way in which French internet users perceive personal data requests from organizations in the context of a commercial website. Drawing on nine individual interviews, she shows that the decision to provide data to a commercial enterprise appears to be related more to the context in which the request is made than to a predisposition to data disclosure. The dilemmas and paradoxes associated with disclosing personal information are described and a justification for their existence is proposed.