13 March 2014 Last updated at 07:37
Study: Social networks like Facebook can spread moods
Facebook screen “What people feel and say in one place may spread to many parts of the globe,” wrote the authors
Continue reading the main story
Facebook’s WhatsApp purchase opposed
Facebook tightens rules on gun posts
Facebook aims to ‘connect the world’
A study by researchers at the University of California, Yale, and Facebook has found that moods can spread virally through social media sites such as Facebook.
Using data from millions of Facebook users, the researchers examined the impact of rainy days.
They found that for every one person directly affected by rain, one to two others would also feel the impact.