By Donna Kallner You know this rural neighbor – the elderly widow who lives alone at the dead end of a road bypassed by the information superhighway. She doesn’t see Facebook, so doesn’t see public service reminders to keep furnace exhaust vents clear during a blizzard. And the specific scenario of blocked vents hasn’t come up in conversations with family members trying to get her to move. Whether she doesn’t know or can’t physically manage to k…