Social travel guide app Jetpac made the conclusion after studying more than 150 million Instagram posts in more than 6,000 cities all over the world . Jetpac have ranked the happiest nations in the world based on their ‘smile score’ formula. The start-up have analysed millions of photos and measured how often residents from countries smile on the photo. The bigger the smile – the bigger the score.
Brazil was deemed to be the happiest nation with the most and biggest smiles. Latin American countries dominated the top 10, with Croatia placed in 90th place on the list.