Why this once isolated tribe took up cell phones and social media

The village of São Luís sits about 200 miles up the Javari River from the town of Atalaia do Norte. It’s home to 200 or so Kanamari people, who have granted me and a film crew permission to visit. For eight days we live in their tidy settlement of wooden stilt houses, rising when Chief Mauro Kanamari (the Kanamari take the tribe’s name as their last name) blows a horn. We accompany the women as they harvest manioc, or cassava, and the men as they hunt and fish.