Not a surprise
Judge, it's something I did for awhile, until I discovered that the organization had no protective firewalls for the people that worked for them. Which set us up for online stalking and the like. It was very easy to find information about people, especially in the early days of the internet, when no one realized just how open it was.
Message boards, genealogy, and when twitter came about and FB, it made it even easier. Recall being able to find a person who was stalking someone online, he had a twitter account that was not private, as well as a photo stream. I wrote up a bio of this fellow, including all of his family, the names of his children, dog, and all his relatives, the company that employed him, where they lived, phone numbers, addresses, and it took me a day to find this information.
This information was used by the organization to protect the young teenager being stalked, once he was shown the information about himself, he stopped stalking the teen, and the bio was destroyed.
Some are simply not careful, the internet is absolutely not like a private letter. Although people seem to regard it as such at times.