From the developer docs: "... web based database that lives “in the cloud”. Objects exist in the database (there is only one instance of Fluidinfo that all users and applications share), users tag objects and (optionally) associate values with the tags."

From the about page: "Fluidinfo is a single web of things providing a no-questions-asked writable social object to represent each and every thing."

This is apparently a reinvention of RDF except centralized and proprietary. By writing triples "anyone can say anything about anything." http://www.w3.org/TR/2002/WD-rdf-concepts-20020829/