Users can set notifications and reminders for how you will be alerted about events and social interactions. Also, users can set their privacy and visibility preferences. View notifications and privacy settings through User Profile->Settings.
All users are opted in by default to receive all notifications. You can opt out of these notifications by removing the check mark and click Save Changes.
Privacy & Visibility
By default, all user profile information can be viewed by Everyone. You can change this selection to either be "Just my friends" or "Nobody." After, click Save Changes.