Have you searched for photos tagged with 'happy' and 'sad'? While there are 54419 photos with 'happy', there are only 6984 with 'sad'. That is because we all like to share our happy moments. Maybe you've already heard it or you've just heard it now. This is the first line of a project I made. If you want to see the project, and learn more about the story behind the idea, keep reading.