User participation, a practice encouraged by many e-businesses these days is considered a positive experience for all involved. Yet this study shows that such encouragement can cause users to expose themselves to potentially harmful consequences, by enhancing their trust in the website and leading them to be more willing to reveal personal information. We perform a series of empirical experiments, utilizing a YouTube-like video browsing platform and find that users who are exposed to prompts that require them to rate videos subsequently report higher trust in the site and reveal more personal information, compared with users who are not exposed to such prompts. Exposure to prompts does not affect users' general attitudes regarding privacy. We test alternative scenarios to attempt to identify the sources of the phenomena, and we link our results to previous work on website-initiated participation and self-perception theory. We discuss both theoretical and policy implications.