The battle for Brazil’s presidency has been fought online. And it’s been as intense as it was in 2018, when President Jair Bolsonaro cruised to victory with a fake news social media campaign that was pumped out over WhatsApp against his leading challenger. This year, the virtual war has been more equally fought across party lines. As Brazilians prepare to vote in the final round of their presidential election on Sunday, Michael Fox reports on the latest from Sao Paulo, Brazil.