Fluidinfo guarantees that about tags (fluiddb/about) are unique and unchanging. These properties make the about tag an ideal identifier. Other tags attached to an object with a given about tag are clearly and unambiguously associated with whatever the about tag specifies. It is, however, important to understand that Fluidinfo ascribes no meaning to about tags or objects; there is no reference mapping between about tags and real-world objects, and there are no rules—only conventions—about which objects should be used to store data in Fluidinfo.

If your data is self-contained, in the sense that it is not combined with or dependent on any other user’s tags, it does not matter very much which objects you use, though it would be perverse and somewhat antisocial to “pollute” objects having an about tag with data that does not pertain to it. As a general principle, if you are not choosing objects on the basis of their about tag, there is a strong case for using objects that have no about tag.