Buckminster fullerene (Bucky balls, to its friends) are not as the contain a fixed number of atoms - (C60).
You won't be asked about Bucky tubes or Graphene where (presumably) the number of Carbon atoms is variable.
Remember, all Giant Covalent structures will have high melting points.
When you explain why you should make sure you explain that the strong covalent bonds require a great deal of energy (and hence a very high temperature) to overcome. No one ever wants to write this because it seems so obvious but it's frequently on the mark scheme.
None of these structure should conduct except Graphite - it is the only one in which there are delocalised electrons.