Anthony G. Attrino reports: Hundreds of employees in the Leonia School District in Bergen County were exposed to a data hack last month when an office worker inadvertently linked their personal information to an online meeting agenda. The Social Security numbers of about 300 teachers, custodians and administrators were exposed to the public for four days before the sensitive information was taken down, district officials told NJ Advance Media on Tuesday. Read more on NJ.com.