On Facebook, the phrase in question typically refers to the user whose profile picture or name appears prominently, often within a circular frame, when another user views a particular piece of content, such as a Story or a Reel. This designation does not imply any special status or privilege for the individual highlighted; it simply represents the person who recently interacted with the content.
The presentation of a viewer in this manner offers a visual cue to the content creator regarding recent engagement. It provides immediate feedback about who is viewing and interacting with their content, aiding in understanding audience reach and potential patterns of interaction. While not a formalized feature with explicitly stated benefits beyond visual feedback, this display contributes to the overall experience of social connectivity and content consumption within the platform.