Fractional Schr\"odinger-Poisson systems with a general subcritical or critical nonlinearity

We consider a fractional Schr"{o}dinger-Poisson system with a general nonlinearity in subcritical and critical case. The Ambrosetti-Rabinowitz condition is not required. By using a perturbation approach, we prove the existence of positive solutions. Moreover, we study the asymptotics of solutions for a vanishing parameter.