The posting invited suggestions as to which school might get "shot up," the Kern High School District said Monday.
Bakersfield police were alerted and visited the student's family Sunday night. Officers determined the threat wasn't credible, according to district spokesman John Teves.
The student, whose name was withheld, was not at school Monday, Teves said. He also said attendance was down about 250 students Monday at Independence High, as parents and students were apparently spooked by the social media posting.
Teves said the district can't disclose how it will punish the student, but he said "disciplinary action for such conduct can include expulsion. In the past, students who have made such threats, even when not credible, have not returned to the school."