Combine the condensed milk, chocolate chips, vanilla and a pinch of salt in a fondue pot with a lighted burner. Stir until the chocolate is just melted and warm. Place offerings such as strawberries, marshmallows, mini pretzels and pound cake cubes on a platter around the fondue pot for guests to choose from. Have fondue forks available for dipping and plates and flatware available for the dipped items (eating right from the fondue fork is bad fondue party etiquette!).