Whistling-only WhatsApp groups are taking off in Brazil(theguardian.com)
theguardian.com
Whistling-only WhatsApp groups are taking off in Brazil
https://www.theguardian.com/world/2026/may/05/brazil-craze-whistling-only-whatsapp-groups
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https://www.theguardian.com/world/2026/may/05/brazil-craze-whistling-only-whatsapp-groups
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