Found this via @dsalo, if I recall correctly. Based on a directed graph of phone and text interactions, a person’s activity can be re-identified.

🔖 How AI can identify people even in anonymized datasets https://www.sciencenews.org/article/ai-identify-anonymous-data-phone-neural-network 🗒 annotated https://via.hypothes.is/https://www.sciencenews.org/article/ai-identify-anonymous-data-phone-neural-network