re: anybody ever turn water main off to prevent pipes from freezing?

a couple of weeks ago when it was freezing i left the water running in the guest bathroom just a little to keep the pipes from freezing. My girlfriend asked what i was doing and when i told her she said "NO...you're supposed to shut off all the water!" I asked who told her that and she said all her friends were telling everyone on facebook. i told her "All your friends are fricking idiots." she was not amused