https://old.reddit.com/r/Damnthatsinteresting/comments/qlv98o/not_everything_is_meant_to_be_shared_on_social/Quick & pretty well done video showing identity theft.
...and this doesn't even show Google searches.
I just tracked down a guy this week from his posts in assorted online forums (my daughter might need a local smarthome programmer for the nursing home). Took me about 20 minutes to find his full name, residence address, past address, names of 2 of his children, where one of those kids went to university, other personal tidbits. And all I was trying to do was verify that he lived near a particular NC city.