How many topics are there in Freebase?
Freebase contains many (15M+) graph nodes or objects which are not Topics. Generally it is because they are not entities in their own right, but there are also some historical holdovers from a time when it was necessary to conserve storage space (most notably, music tracks). Below is a list of some non-Topic object types that Tom Morris posted to the freebase-discuss list in March, 2010: • CVTs – sometimes called mediators, which connect multiple things together or include some connections and some data.
