Now that we are at stalkers.
There is one fella on /ausneets/ who isn't a good fella by far, becaue he tries doxxing people, and even stalk them. Apparently he did find one bloke, although it seems they live in same city. But his example shows that with enough autism, just from photos and textual breadcrumbs, applying logic and doing endless hours of google map/streetview searches one can find, close on people.
The thing is knowing he is doing it actually is a good reminder to be careful when posting personal stuff. People in familiar environment tend to let their guard down, and become careless. As far as I know and for now he is relatively harmless, but such people are obviously annoying and even can be terrifying for those who are targeted, they also can be put into uncomfortable situation which detrimentally effect their life, their family, or their career. But out there can be people who are actually want do to harm, or belong to an organization, be it criminal, law enforcement, or some other government agencies, who will try to exploit the information they gather.
So be careful, Bernd, and stay safe.