Did a WhatsApp channel help get Lula re-elected?

Lula da Silva secured his fourth term as the country's president in an unlikely comeback being credited by a WhatsApp channel led by Congressman André Janones.

The channel called "Lula's Army" rapidly grew to 10.8 million followers by the second round.

BBC Brasil's João Fellet looked into the role of the community in Lula's victory.