The Short Version
The claim accurately reflects an official announcement by Turkey's General Directorate of Security (EGM) that 591 social media accounts were identified in connection with school attacks in Kahramanmaraş and Şanlıurfa. Multiple outlets, including the editorially independent Hürriyet Daily News, corroborate the figure. The word "allegedly" in the claim appropriately signals this is an official allegation, not independently verified wrongdoing. The 591 figure is part of a broader enforcement action that also included 940 blocked accounts and 83 arrest orders.