All information (Categories, Fields, Items, Alerts) that you enter into anyInput is shared by default. Anyone can view your information by browsing to a page that contains your information.
You can disable sharing by checking Sharing Disabled in Settings.
Note: If it is not detrimental to share your information, then please do not check Sharing Disabled. When anyone can view your information, relationships can be built revolving around that information. For example, two people with Stamp collections may discover information about Stamps from one another.