An audit of 42 AI chatbot platforms found 21 leak conversation titles to third-party trackers and nine leak verbatim user prompts
AspireAI community · arXiv
*The privacy story most people assume is about what the model itself retains - but the first systematic measurement of the web side of chatbot privacy points somewhere less comfortable.* Researchers instrumented the browser at the JavaScript engine level to attribute each data flow to the exact user action that triggered it, a granularity network interception alone cannot see. Across 42 general-purpose and domain-specific platforms - including health, legal and education chatbots - 21 leak conversation titles to third-party trackers and nine leak verbatim user prompts. A substantial number also send user emails to those trackers, which allows conversational context to be tied to a real identity. The limitation: the sample is 42 web applications, and the study measures what the page does rather than what a server-side vendor does with it, so the numbers describe a real but partial slice of the exposure.
Read the story and explore more from the AspireAI community.
Two sparse-autoencoder analyses have resisted scaling: matching semantically similar features across layers, and compressing large feature circuits into interpretable supernodes. This paper argues both are the same underlying problem, estimating semantic distances between SAE features that sit on different activation manifolds. Its representation treats each feature not as a single decoder vector but as an activation-weighted distribution over the hidden states expressing it, projects those distributions into a shared reference space, and compares them with Wasserstein distance. The representation is proved invariant to activation rescaling and stable under perturbation, and recovers true matches under finite-sample margin conditions. Empirically it outperformed decoder-vector and LLM-based baselines and captured subtle functional distinctions between related features, and it compressed large feature circuits into interpretable supernodes automatically. The limitation is that this is interpretability tooling: the paper demonstrates better feature matching and circuit compression, not that downstream interpretability claims become more accurate.