第一個提到的是 PornHub 用機器學習辨識演員以及各種「其他資訊」，這邊引用的報導是 TechCrunch 的「PornHub uses computer vision to ID actors, acts in its videos」：
PornHub is using machine learning algorithms to identify actors in different videos, so as to better index them.
The computer vision system can identify specific actors in scenes and even identifies various positions and… attributes.
People are worried that it can really identify them, by linking their stage names to their real names.
最後是提到 Facebook 已經有能力這樣做，而且已經發生了：
Facebook somehow managed to link a sex worker's clients under her fake name to her real profile.
Her sex-work identity is not on the social network at all; for it, she uses a different email address, a different phone number, and a different name. Yet earlier this year, looking at Facebook’s “People You May Know” recommendations, Leila (a name I’m using using in place of either of the names she uses) was shocked to see some of her regular sex-work clients.
這個議題與 Mass surveillance 有點像...。