Vehicular　social　networks　(VSNs)　have　emerged　as　the　promising　paradigm　of　vehicular　networks　that　can　improve　traffic　safety,　relieve　traffic　congestion　and　even　provide　comprehensive　social　services　by　sharing　vehicular　sensory　data.　To　selectively　share　the　sensory　data　with　other　vehicles　in　the　vicinity　and　reduce　the　local　storage　burden　of　vehicles,　the　vehicular　sensory　data　are　usually　outsourced　to　vehicle　cloud　server　for　sharing　and　searching.　However,　existing　data　sharing　systems　for　VSNs　can　neither　provide　secure　selective　one-to-many　data　sharing　and　verifiable　data　retrieval　over　encrypted　data　nor　ensure　that　the　integrity　of　retrieved　data.　In　this　paper,　we　propose　FTDS,　a　secure　flexible　and　tampering-resistant　data　sharing　system　for　VSNs　by　introducing　a　novel　secure　key-aggregate　search　encryption　scheme　and　a　tampering-resistant　blockchain　technology.　With　the　proposed　FTDS　system　for　VSNs,　the　vehicular　sensory　data　can　be　selectively　shared　and　retrieved　in　a　fine-grained　way.　Besides,　our　system　allows　vehicle　data　users　to　detect　any　unauthorized　manipulation.　Then,　we　present　the　detailed　security　analysis　to　prove　that　the　proposed　data　sharing　system　can　achieve　both　selective　security　and　verifiability.　We　also　evaluate　its　performance　and　demonstrate　that　it　is　efficient　and　practical　for　the　VSNs　scenarios.