A North Dakota mother was so upset with her daughter's poor behavior that she went on Facebook to get rid of her concert tickets. Cindy Bjerke posted her 18-year-old daughter's Katy Perry tickets on the Fargo Moorhead Online Garage Sale Facebook page to teach her a lesson. Bjerke called the girl a "spoiled brat" who "doesn't deserve these tickets." The Perry concert is scheduled for August 23th. "I was not going to give her these tickets. I was not going to let her go to the concert with the behavior she's been doing," Bjerke said. The tickets were worth $110, but Bjerke undersold them for $90. Some people were critical of Bjerke's very public parenting style, but she is sticking by her decision to use social media as a teaching vessel. "I think a lot of parents are like me and feel they are being bullied over how they should parent their own children," she said.