By JASMINE BALA Staff reporter Mexico’s drug cartels are making full use of cyberspace to mount a campaign of intimidation targeting the country’s journalists and society, says exiled Mexican journalist Luis Horacio Nájera. Since he fled Mexico in 2008, the drug cartels’ presence on social media has expanded and they now broadcast torture, decapitations and killings on blogs like Blog Del Narco, Nájera said during a March 9 presentation at the Ryerson School of Journalism. Nájera, who is now the PEN Canada George Brown Writer-in-Residence, said reporting on drug cartels and political corruption is now so dangerous for journalists that…