Embodiments of the present disclosure provide methods, systems, apparatuses, and computer program products for sharing a shared interface and allowing participants to annotate the shared interface within a group-based communication system. A shared interface is shared by an interface sharing device to participating devices, which can then individually annotate the shared interface by creating interface annotations that then are shared on the shared interface by the interface sharing device. Such methods, systems, apparatuses, and computer program products provide for an efficient and effective method of advancing discussions among a group in a group-based communication system.