Don't worry, your calendar stays private.
We think calendars should be private. No one will ever see your calendar, and the content in your calendar will never be shared. We believe in privacy so much that we hard delete data every 30 days from our servers. Fringe only references your calendar to find specific times you are free for dinner, lunch, brunch, etc..Fringe uses the most common calendars (Google, iCal, and Exchange) to find common available times for you and up to 5 of your friends to get together.