I feel bad for the new generation of Twitch/Youtube people who are exposing themselves to the Internet. There are some freaky good stalkers out there.
> a flag emblazoned with the words "He Will Not Divide Us" would be flown for the duration of the presidency. The camera was pointed up at the flag, set against a backdrop of nothing but sky.
> Within 38 hours of resuming transmission, the flag was located by a collaboration of 4chan users, who used airplane contrails, celestial navigation, and other techniques to determine that it was located in Greeneville, Tennessee.
https://en.wikipedia.org/wiki/LaBeouf,_R%C3%B6nkk%C3%B6_%26_...
It starts even before they expose themselves in the form of parents who post everything about their kids on Facebook.
That doesn't quite do the situation justice. The stalking gets crowdsourced; often to people who are well practiced at it.