How private is Google Docs?

When creating a document in google docs. How private is it? If I created a document can all of my contacts view the right a way? or I have to enable them to view it first? I want to store some private data on it and not willing to make a mistake.|||You have to share a document for others to see it. It's private by default.|||If you elect to allow someone to view or collaborate on a document, note that information you disclose can be viewed, or possibly copied or redistributed, by those you've allowed to view or collaborate on the document or chat. As such, use care when including sensitive personal information, such as social security numbers, financial account information, home addresses or phone numbers, in your shared documents and chats.|||http://in.answers.yahoo.com/question/ind鈥?/a>