A couple of weeks ago we were told by management we could change our screen names if we wanted to. Is there a rule about the number of times one can change their screen name, and if so, is it enforced?

I've never understood why anyone would want to change their screen name. I think it would be very confusing to others.... just my opinion. Is it OK if a person changes their screen name every week, every month, every year, etc? What's the ruling on this?