Unique on Facebook : Formulation and Evidence of (Nano)targeting Individual Users with non-PII Data

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2021
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González-Cabañas, José
Cuevas, Ángel
Cuevas, Rubén
López-Fernández, Juan
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IMC '21 : Proceedings of the 21st ACM Internet Measurement Conference. New York, NY, United States: Association for Computing Machinery, 2021, pp. 464-479. ISBN 978-1-4503-9129-0. Available under: doi: 10.1145/3487552.3487861
Zusammenfassung

The privacy of an individual is bounded by the ability of a third party to reveal their identity. Certain data items such as a passport ID or a mobile phone number may be used to uniquely identify a person. These are referred to as Personal Identifiable Information (PII) items. Previous literature has also reported that, in datasets including millions of users, a combination of several non-PII items (which alone are not enough to identify an individual) can uniquely identify an individual within the dataset. In this paper, we define a data-driven model to quantify the number of interests from a user that make them unique on Facebook. To the best of our knowledge, this represents the first study of individuals' uniqueness at the world population scale. Besides, users' interests are actionable non-PII items that can be used to define ad campaigns and deliver tailored ads to Facebook users. We run an experiment through 21 Facebook ad campaigns that target three of the authors of this paper to prove that, if an advertiser knows enough interests from a user, the Facebook Advertising Platform can be systematically exploited to deliver ads exclusively to a specific user. We refer to this practice as nanotargeting. Finally, we discuss the harmful risks associated with nanotargeting such as psychological persuasion, user manipulation, or blackmailing, and provide easily implementable countermeasures to preclude attacks based on nanotargeting campaigns on Facebook.

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The 21st ACM Internet Measurement Conference (IMC'21), 2. Nov. 2021 - 4. Nov. 2021, online
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ISO 690GONZÁLEZ-CABAÑAS, José, Ángel CUEVAS, Rubén CUEVAS, Juan LÓPEZ-FERNÁNDEZ, David GARCIA, 2021. Unique on Facebook : Formulation and Evidence of (Nano)targeting Individual Users with non-PII Data. The 21st ACM Internet Measurement Conference (IMC'21). online, 2. Nov. 2021 - 4. Nov. 2021. In: IMC '21 : Proceedings of the 21st ACM Internet Measurement Conference. New York, NY, United States: Association for Computing Machinery, 2021, pp. 464-479. ISBN 978-1-4503-9129-0. Available under: doi: 10.1145/3487552.3487861
BibTex
@inproceedings{GonzalezCabanas2021Uniqu-59970,
  year={2021},
  doi={10.1145/3487552.3487861},
  title={Unique on Facebook : Formulation and Evidence of (Nano)targeting Individual Users with non-PII Data},
  isbn={978-1-4503-9129-0},
  publisher={Association for Computing Machinery},
  address={New York, NY, United States},
  booktitle={IMC '21 : Proceedings of the 21st ACM Internet Measurement Conference},
  pages={464--479},
  author={González-Cabañas, José and Cuevas, Ángel and Cuevas, Rubén and López-Fernández, Juan and Garcia, David}
}
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