Vigilante Marketing is a side mission in the video game, "South Park: The Fractured But Whole".
Plot details follow.
Help Ms. Cartman promote her tutoring service.
Once you acquire the Fartkour Buddy Power, go to Cartman's House. Talk to his mom in the kitchen. She will ask you to spread her tutoring business cards around Skeeter's Wine Bar. Give them to the three men here before returning to Ms. Cartman. She will reward your efforts with Ms. Cartman's Double Stuffed Brownies.