With the prevalence of catfish out there scamming people left and right, I don't think is such a bad idea.
The problem is that when you piece together their location with other facts you may know about them - like their occupation, their field of study, their relative distance from certain places, maybe their children's age - it becomes easier to stalk and track people down. It's inviting trouble that may end badly.
I think there should always be some level of privacy when you don't know someone's intentions or mindset in order to protect their well-being. You should always start with the assumption that you never know who you're dealing with online