The numbers of spin states for elementary particles is calculated by two times its spin value plus 1. For example, the electron is a spin half particle its number of spin states is ½×2+1=2. For a spin-1 photon its spin states is 1×2+1=3. For a spin-2 graviton its spin states is 2×2+1=5. Since both photon and graviton are massless, they always move at the speed of light. The ability to move at max speed of the universe prevents the full detection of all their spin states. So that in practice only two of the spin states of photon can be detected. As for the graviton, not so much as worrying about its spin states, even the particle itself cannot be detected. For what all the fuss is about, the graviton might really be a massless Higgs boson. Both with only one spin state and a spin value of zero. The billion dollar question is can one spin state of spin zero massless particle exist?