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Publications by Pedro Giovanni Leon (bibliography)
Ur, Blase, Leon, Pedro Giovanni, Cranor, Lorrie Faith, Shay, Richard and Wang, Yang (2012): Smart, useful, scary, creepy: perceptions of online behavioral advertising. In: Proceedings of the 2012 Symposium on Usable Privacy and Security 2012. p. 4.
We report results of 48 semi-structured interviews about online behavioral advertising (OBA). We investigated non-technical users' attitudes about and understanding of OBA, using participants' expectations and beliefs to explain their attitudes. Participants found OBA to be simultaneously useful and privacy invasive. They were surprised to learn that browsing history is currently used to tailor advertisements, yet they were aware of contextual targeting. Our results identify mismatches between participants' mental models and current approaches for providing users with notice and choice about OBA. Participants misinterpreted icons intended to notify them about behavioral targeting and expected that they could turn to their browser or antivirus software to control OBA. Participants had strong concerns about data collection, and the majority of participants believed that advertisers collect personally identifiable information. They also misunderstood the role of advertising networks, basing their opinions of an advertising network on that company's non-advertising activities. Participants' attitudes towards OBA were complex and context-dependent. While many participants felt tailored advertising could benefit them, existing notice and choice mechanisms are not effectively reaching users.
© All rights reserved Ur et al. and/or their publisher
Wang, Yang, Norcie, Gregory, Komanduri, Saranga, Acquisti, Alessandro, Leon, Pedro Giovanni and Cranor, Lorrie Faith (2011): "I regretted the minute I pressed share": a qualitative study of regrets on Facebook. In: Proceedings of the 2011 Symposium on Usable Privacy and Security 2011. p. 10.
We investigate regrets associated with users' posts on a popular social networking site. Our findings are based on a series of interviews, user diaries, and online surveys involving 569 American Facebook users. Their regrets revolved around sensitive topics, content with strong sentiment, lies, and secrets. Our research reveals several possible causes of why users make posts that they later regret: (1) they want to be perceived in favorable ways, (2) they do not think about their reason for posting or the consequences of their posts, (3) they misjudge the culture and norms within their social circles, (4) they are in a "hot" state of high emotion when posting, or under the influence of drugs or alcohol, (5) their postings are seen by an unintended audience, (6) they do not foresee how their posts could be perceived by people within their intended audience, and (7) they misunderstand or misuse the Facebook platform. Some reported incidents had serious repercussions, such as breaking up relationships or job losses. We discuss methodological considerations in studying negative experiences associated with social networking posts, as well as ways of helping users of social networking sites avoid such regrets.
© All rights reserved Wang et al. and/or ACM Press
Shay, Richard, Komanduri, Saranga, Kelley, Patrick Gage, Leon, Pedro Giovanni, Mazurek, Michelle L., Bauer, Lujo, Christin, Nicolas and Cranor, Lorrie Faith (2010): Encountering stronger password requirements: user attitudes and behaviors. In: Proceedings of the 2010 Symposium on Usable Privacy and Security 2010. p. 2.
Text-based passwords are still the most commonly used authentication mechanism in information systems. We took advantage of a unique opportunity presented by a significant change in the Carnegie Mellon University (CMU) computing services password policy that required users to change their passwords. Through our survey of 470 CMU computer users, we collected data about behaviors and practices related to the use and creation of passwords. We also captured users' opinions about the new, stronger policy requirements. Our analysis shows that, although most of the users were annoyed by the need to create a complex password, they believe that they are now more secure. Furthermore, we perform an entropy analysis and discuss how our findings relate to NIST recommendations for creating a password policy. We also examine how users answer specific questions related to their passwords. Our results can be helpful in designing better password policies that consider not only technical aspects of specific policy rules, but also users' behavior in response to those rules.
© All rights reserved Shay et al. and/or their publisher
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