The outdated myth that a single human being controls a single account on your Internet service is no longer adequate to understand who is using your system for which purpose. We model identity in three tiers. The "group" tier includes households, families, companies, and other social circles of people who are connected in some way. The "human being" tier is our best-guess, frequently-changing approximation of the human being that may be using our system at the moment. The "account" tier is the user account that was used to authenticate this user. In this talk we explain how some of these approximations are currently inferred, and which behaviors give insights into probabilities associated with the probabilities / weights of each inferred link.
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