Teacher-Student Relationship : How open is too open?

Hi everyone,

I’ve been thinking about something recently and would like to hear what you have to say about it.

Everyday we interact with our students in and out of class. Over time we may build relationships with some of our students, some closer than others. Some of us may even go out from time to time with some of those students and obviously discuss various topics, some of which may revolve around you, as some students are curious to know more about their teacher.

My question is therefore,

How open is too open?

What I mean is how much should we let our students know about ourselves as a person? Of course there is a limit, but beyond the obvious, how open should we be with our students?

Cheers,
eisensei