Problem
Research questions and friction points this paper is trying to address.
Extended Identifiers
Third-Party Cookies
Digital Advertising Ecosystem
Privacy Concerns
Accuracy
Bridging the Gap: A Longitudinal Analysis of Extended Identifiers in the Post-Cookie Era
🤖 AI Summary
研究通过41个月的分析，探讨了扩展标识符（EID）在后Cookie时代的使用情况及其准确性与隐私问题。
📝 Abstract
As third-party cookies fade because of browser restrictions, the online advertising ecosystem is turning to extended identifiers (EIDs) as an alternative. EIDs are persistent user identifiers, such as hashed email addresses, that are employed to link users across domains and devices. This paper presents a 41-month longitudinal study examining EID usage in over 145 million HTTP header bidding requests sent to six major supply-side platforms (SSPs) from 616,539 websites. Our findings show that EIDs are widely used and are becoming increasingly prevalent in the digital advertising ecosystem, reaching 83.76% of studied websites by May 2025. Our analysis of the 18 popular EID providers that account for 99.42% of all transmitted EIDs in our dataset raises concerns about the readiness of EIDs as an alternative to third-party cookie tracking. In terms of accuracy, only one identity provider consistently recognizes and identifies that the visitor is a self-identified bot crawler, and many providers regularly transmit multiple EIDs for the same visitor. We also identify privacy concerns with EIDs, as 12 of the providers create persistent EIDs that can identify the same user across visits, websites, devices, and months. Finally, we found that 16 providers transmit EIDs on EU websites without user consent.
Innovation
Methods, ideas, or system contributions that make the work stand out.
Extended Identifiers
Longitudinal Study
Digital Advertising Ecosystem
Privacy Concerns
Third-Party Cookie Alternatives
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