Thousands of Colombians on Monday marched in repudiation of Farc guerrillas and its practice of kidnapping, in a demonstration organised through Facebook, the social networking site.

Waving flags and wearing white T-shirts printed with “No more kidnapping, No more lies, No more killing, No more Farc,” protesters streamed out of offices and homes as the rally snaked through Bogota to the Andean capital’s main plaza. The organisers claimed the protest was one of Colombia's biggest, demonstrating a growing indignation with the kidnappings.