Nicole Shuntara Wilson, 18, told North Augusta Public Safety she brought the knife to school after a picture of her was on a Facebook page about the school.
A teacher found the page Thursday because she was alerted there might be a fight at the school based on online information. When the teacher confronted Wilson, she found the knife in her purse.
When police confronted Wilson about the knife, she said she brought it for “protection.”
“She believed herself to be threatened based on what had transpired (online),” Lt. Tim Thornton said.
Wilson was arrested for disturbing schools, and she was released shortly after on bail.