A Scottish video aiming to get people talking about mental health has united people all over the world.
The video, titled 'Power of Okay', looks at how people worry about what others think of them when they are struggling with their mental health.
But the campaign has gained momentum since it was posted on Reddit on Thursday.
In fact, the clip has received more than 150,000 views in 24 hours and has encouraged hundreds of people from around the world to speak up on Reddit about their experiences of mental health issues.
Commenting on why they created the film in the first place, Greenhill said: "We just want a discussion about mental health to be started rather than people being scared of saying the wrong thing and just not saying anything.
"The simple start-off point of 'okay' seemed really powerful. If we all start out at that base level of human kindness, I think the world would be a lot better."
Mental illness reduces life expectancy as much as smoking 20 cigarettes a day.
Forty per cent of workers suffering depression don’t tell their employers about their diagnosis.
Twenty-four per cent of workers suffering depression could not continue to work during their last episode of depression, taking an average of more than two months off work (49 lost working days) in that episode.
Eighty per cent of Canadian employers rate mental health problems and illnesses among the top three causes of both short- and long-term disability claims made by their employees.
More than 30 per cent of disability claims and 70 per cent of disability costs in Canada are attributed to mental illness.
One quarter of Canadian workers describe their day-to-day lives as highly stressful, and 62 per cent of those listed their jobs as their main source of stress. The majority of highly stressed employees are men (55 per cent), and over half work in white-collar jobs.