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Auditing Partisan Audience Bias within Google Search

Published: 01 November 2018 Publication History

Abstract

There is a growing consensus that online platforms have a systematic influence on the democratic process. However, research beyond social media is limited. In this paper, we report the results of a mixed-methods algorithm audit of partisan audience bias and personalization within Google Search. Following Donald Trump's inauguration, we recruited 187 participants to complete a survey and install a browser extension that enabled us to collect Search Engine Results Pages (SERPs) from their computers. To quantify partisan audience bias, we developed a domain-level score by leveraging the sharing propensities of registered voters on a large Twitter panel. We found little evidence for the "filter bubble'' hypothesis. Instead, we found that results positioned toward the bottom of Google SERPs were more left-leaning than results positioned toward the top, and that the direction and magnitude of overall lean varied by search query, component type (e.g. "answer boxes"), and other factors. Utilizing rank-weighted metrics that we adapted from prior work, we also found that Google's rankings shifted the average lean of SERPs to the right of their unweighted average.

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cover image Proceedings of the ACM on Human-Computer Interaction
Proceedings of the ACM on Human-Computer Interaction  Volume 2, Issue CSCW
November 2018
4104 pages
EISSN:2573-0142
DOI:10.1145/3290265
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Published: 01 November 2018
Published in PACMHCI Volume 2, Issue CSCW

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  1. algorithm auditing
  2. filter bubble
  3. political personalization
  4. quantifying partisan bias
  5. search engine rankings

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