Within the Instagram messaging system, a blue icon signifies a direct message sent using the vanish mode feature. When a user sends a message within vanish mode, the text, photos, or videos disappear after the recipient has viewed them and exits the chat. This visual cue distinguishes these ephemeral communications from standard messages, which remain accessible until manually deleted.
The implementation of disappearing messages provides an additional layer of privacy and control over shared content. It allows users to engage in conversations where the record is not permanently stored, which can be beneficial for sharing sensitive information or engaging in spontaneous interactions without creating a lasting digital footprint. This functionality addresses a growing demand for features that prioritize user privacy and ephemeral content sharing.