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AIs can guess where Reddit users live and how much they earn
(www.newscientist.com)
This is a most excellent place for technology news and articles.
Yup, and plenty of people have no issues posting about local events or joining region/city specific groups, so it's not exactly hard to put two and two together.
I don't have much issue posting about the city I grew up in or former jobs, but generally work at being fairly vague about anything current