What is the main idea.

1) When we speak of a "close friend," we usually mean an intimate friend, not a friend who is standing close by.

2) However, according to researchers who study human behavior, there are in fact four "distance zones" in human interaction.

3) Intimate distance is the closest zone, eighteen inches or less.

4) This is the zone of making love, for instance, and also of physical confrontations ("in your face!").

5) Second is personal distance, eighteen inches to four feet, which is used for everyday conversations with friends.

6) Then there is social distance, four to seven feet, which we use for most interactions with strangers, such as buying something in a store.

7) The fourth zone is public distance, twelve feet or more.

8) A public speaker or a singer at a concert is usually at least twelve feet from the nearest audience members.