You can set permissions on collection in Firebase, see e.g. http://thinkingonthinking.com/build-your-email-list-with-firebase/ http://thinkingonthinking.com/bui

You can set permissions on collection in Firebase, see e.g. http://thinkingonthinking.com/build-your-email-list-with-firebase/ http://thinkingonthinking.com/build-your-email-list-with-fir... - additionally, you can provide OAuth authentication, and have user modify their own data.