It is the most popular colour – As mentioned above, blue is the most popular colour in general so it only makes sense that is is popular when it comes to design.
The next darkest colour to black is blue – Why is this relevant? Blue has always been the default colour for a link but no one knows why or who made that decision. Mosaic, one of the earliest internet browsers, decided to make blue the default colour of links blue as it was the closest colour to black in its contrast to white, thus making it the most eligible colour choice for web pages.
Mark Zuckerberg is colour blind – Mark Zuckerberg, the creator of Facebook, decided to make Facebook’s main colour blue because, well… it wasn’t really much of a choice. Mark is colourblind making him unable to see red or green and so blue is the only colour he can fully interpret. Due to Facebook being one of the most popular sites in the world it is no surprise that the trend of blue being a commonly used colour has stuck.
Now you know why blue is used so often on the web. If you found this blog article interesting, you can read more here.