Why blue became Facebook’s defining color
The choice was tied to how Mark Zuckerberg sees color. He has red-green color blindness, which can make differences among some reds and greens harder to distinguish. Blue, by contrast, is a color he can see clearly—so it stood out as a practical choice for an interface he used and helped shape.
That personal advantage had a visible effect: blue became a recurring color across Facebook’s interface and branding. A color used in menus, links, and other prominent elements can make a site feel visually consistent, even as its individual screens change. Blue gave Facebook a recognizable visual thread without requiring every part of the interface to look the same.
A useful color is not a complete design
The choice also illustrates a distinction in interface design: a color can be easy for one person to see without being enough to guide every user. People perceive colors differently, and screens, lighting, and neighboring colors can affect how clearly an element stands out. Designers therefore need other signals—such as text, shape, or placement—when an element’s meaning matters.
Facebook’s blue began with a straightforward personal reason, but it became more than a preference. It turned a visual accommodation into a durable part of the site’s identity.
