The web - based online School Safety and Security survey reviewed more than 800 school threats reported in the media during the first semester of the 2014 - 15 academic year . Researchers estimated that about one - third of cases involved violent remarks sent anonymously via text messages , social media or other online media .
The Ohio-based National School Safety and Security Services reviewed more than 800 school threats covered in the media during the first half of the 2014-15 academic year . Researchers found that about one-third of cases involved violent remarks sent anonymously via text message , social media or other online means .