Depending on the job (and the name of the employee) it's possible to link past jobs with carefully crafted google searches. Also facebook posts can be found (even for private facebook profiles, posts are still subject to google cacheing so they can be read) and linkedin profiles read etc.
Bit more technical than what you wanted but for anyone that knows how to google it's only a 5min job unless you've got an exceptionally common name like smith or jones or williams. I do it for people that apply for stuff where I work and we're only a small firm. I would guess bigger firms might do it as standard now.