FB

Fb is an abbreviation with several distinct meanings across different fields. The most familiar is Facebook, a social networking platform launched in 2004 by Mark Zuckerberg and co-founders. Facebook allows users to create profiles, share updates, post media, and interact via comments, likes, and messages. The company later reorganized under the corporate umbrella of Meta Platforms, Inc., and the stock formerly traded under the symbol FB now trades under META.

In computing and digital graphics, fb commonly stands for framebuffer, the portion of video memory that stores the image sent to a display. In Unix-like systems, devices such as /dev/fb0 represent framebuffer devices, and software utilities can manipulate resolution, color depth, and scanout.

In physics, femtobarn (fb) is a unit of area used to express cross sections in particle interactions. One femtobarn equals 10^-43 square meters, and cross sections are frequently measured in barns and their submultiples like fb in high-energy experiments.

Other informal uses include fb as shorthand for Facebook in online text and short forms, and FB as an abbreviation for feedback in engineering diagrams or theoretical notation. The meaning of fb depends on context, and disambiguation is often necessary in written text.