A new campaign is encouraging Facebook users to log off the social media website for 99 days to see if it makes them happier.
The experiment, 99 Days of Freedom, asks those who take part to complete surveys after 33, 66, and 99 days.
It's in response to recent reports Facebook conducted an experiment looking at users' moods and changed up the newsfeeds of 700,000 unwitting people as part of the research.
"Like a lot of Facebook users, many of us were bothered by reports of secret mood experiments," said Merjin Straathof of the Dutch creative agency Just.
Straathof said someone jokingly asked, "How do you feel when you don't use Facebook?"
"There was group laughter, followed by, 'Wait a second. That's a really good question!'"
The project will see users save an average of 1,683 minutes, or more than 28 hours, they would normally spend on Facebook in the course of 99 days.