Mexico's presidential race is getting unexpectedly heated, with candidates trading barbs via social channels. Campaigns vie to create trending Twitter topics and celebrate their widely shared tweets as major campaign victories, even as some lament the way social chatter has lowered the tone of the debate. "Twitter is like a jungle. ... With the anonymity, it is like a free-for-all," says Aurelio Nuño Mayer, media director for Enrique Peña Nieto's campaign.
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