Facebook is represented by a white lowercase “f” in a blue square.
The symbol became one of the most recognizable social-media icons after Facebook expanded beyond its original website audience. Its blue-and-white design was used across the company’s website, mobile apps, and promotional materials for many years.
The lowercase “f” is a shortened visual form of the Facebook wordmark. The blue color was also closely associated with the platform’s identity and has often been linked to Mark Zuckerberg’s red-green color blindness, although the logo’s branding decisions have included broader design and usability considerations.
Facebook’s parent company changed its corporate name to Meta in 2021, but Facebook remained the name of the social-networking service. This distinction matters: Meta’s corporate identity and Facebook’s app branding are not the same logo system.