What is the difference between a circle and a place?

A place is a spot you name: home, school, the office. It is stored on your phone, with its coordinates and radius.

A circle is a group of people: your family, a duo, a team. The circle is where you choose which places you share and what its members learn about you.

When a member arrives at a shared place of the circle, the other members are told, if that member chose to share those events. A place can be shared in several circles, or in none.