 Milgram specified that for a person to become a familiar stranger, they must be observed repeatedly over a certain amount of time but never interact with each other.Familiar strangers are more than complete strangers but do not rise to the level of an acquaintance.But if such individuals meet in a different setting, for example a different city or off the street, they are more likely to introduce themselves than would be perfect strangers, as they have a background of shared experiences.