On Instagram, “FB” commonly signifies Facebook. It’s used as a shorthand reference to the Facebook platform, often indicating a connection, cross-promotion, or shared functionality between the two social media services. For example, a user might say, “Link your Instagram to FB,” implying that they should connect their Instagram account to their Facebook profile.
The link between Instagram and Facebook is important because they are both owned by Meta Platforms. This ownership allows for integrated features, such as cross-posting content, running ads across both platforms, and leveraging shared user data for targeted advertising. The historical context stems from Meta’s acquisition of Instagram in 2012, after which the integration between the two platforms steadily increased, benefiting businesses and individual users looking to expand their reach.