10. Mark Zuckerberg Chose Blue As Facebook's Primary Colour... Because He Is Colourblind
It may be recognisable all over the world nowadays due to its blue background and white writing but creator Mark Zuckerberg didn't just choose the colour because he had a fondness for it - but because he is red-green colourblind. Yes, Facebook's creator wanted a colour that he could easily recognise and work with, and not risk incorrectly viewing the wrong shade.