Are spreadsheets always public?
Nope, you can always mark your spreadsheets as Private. To do this, when editing your spreadsheet, click on the Share link, which you’ll find below your spreadsheet on the right hand side. A dialog will appear where you can mark your spreadsheet as Private or as Public. Don’t forget to Save your sharing changes. By default, new spreadsheets are marked Public instead of Private. Public spreadsheets are viewable by anyone.
