She doesn't believe I will post it

"You're not going to do that," she replies triumphantly with her face regaining colour.

"That is where you are mistaken. You've logged in front of me to your school acount so many times I know your password," I smile and pull out my phone and show her. "And since you don't believe me, I guess I have to..." I go to her account and post publicly the photo I took. Further, I changed her passwprd so she wouldn't know.

Meanwhile she glared at me and tried to struggle out. But I kept a firm grip. When I posted the photo she just stopped and looked at my phone at disbelief.