Driven　by　the　rapid　development　of　information　technology,　online　social　networks　(OSNs)　have　experienced　a　fast　development　in　recent　years,　allowing　increasingly　more　people　to　share　and　spread　information　over　OSNs.　The　rapid　rise　of　OSN　platforms　such　as　Facebook　and　Twitter　is　sufficient　evidence　of　such　development.　As　one　type　of　information,　privacy　information　can　also　be　created　and　disseminated　over　an　OSN,　posing　a　severe　threat　to　individual　privacy.　This　article　attempts　to　construct　a　model　for　disseminating　privacy　information　in　OSNs　and　to　analyze　the　model　by　simulating　the　dissemination　process　of　privacy　information　in　OSNs.　First,　we　establish　network　models　that　exhibit　the　main　characteristics　of　OSNs.　Second,　by　considering　the　factors　related　to　social　relationships,　especially　intimacy　between　users　and　the　attention　of　users　to　the　privacy　subject,　we　derive　the　parameters　for　privacy　information　dissemination　models　in　OSNs.　Third,　based　on　the　theory　of　information　dissemination　dynamics,　we　construct　a　model　for　information　dissemination　that　conforms　to　the　properties　of　privacy　information.　We　also　present　some　experimental　results　based　on　the　constructed　model　and　analyze　the　characteristics　of　privacy　information　dissemination.　Fourth,　we　study　and　verify　the　various　properties　of　the　model　through　a　set　of　experiments.　The　proposed　model　provides　the　opportunity　to　better　understand　the　dynamics　of　privacy　information　dissemination　in　OSNs　and　the　effect　of　user　behavior　on　dissemination.　In　this　paper,　we　constructed　a　privacy　information　dissemination　model　for　OSNs　by　considering　factors　that　affect　the　dissemination.　Our　experiment　and　analysis　indicated　that　network　structures　would　affect　the　dissemination　of　private　information　and　privacy　information　can　often　be　disseminated　very　fast　and　spread　very　widely.　image