User information is kept as private as possible. Only your username is displayed publically on this website. Please be aware that IP addresses (like most websites) are logged when editing pages or registering on this website. Only trusted administrators are able to see this. If you don't like it, don't contribute. At the end of the day it is just an IP address. Your IP is probably more public than you think.
While we try not to release private information about companies, contributors may do this from time to time. If this does happen feel free to contact us on the help page. You must be a director at the company in question.