Yes.
I recall some dick on another forum and just out of curiosity I went through his previous comments. I pulled an email address. From that single piece of information came his job, his colleagues, approximately how much money he made, where he lived (worked from home sometimes), when he bought his house and how much he paid for it (onthehouse.com.au), photos of inside his house.
Note that I wasn't even trying. It all just flowed out of the interwebs Google.
Other comments told me about his love life and a lot of personal history. The path he rode to work on. the watch he wore. Where he went for holidays and who with. The clothes he wears. Where he grew up. What his previous employer said in a report when he left, and so on.
Some so personal I won't reiterate. How much and how easy it was to obtain this information was unbelievable.
Total time: 5 minutes.