Abstract: Extensible media and/or activity sharing within a voice call or concurrent real-time communication session is enabled. A concurrent voice call may contextualize shared media and/or activities. Users may share live experiences within the context of a voice call. Continuous, changing real-time media types such as periodic media (e.g., a user's current location) and streaming media (e.g., what the user is currently “seeing” through their personal video camera) may be shared, as well as interactive activities and atomic media types such as an image or a text message. Such sharing may have a unidirectional modality, for example, one party may offer to share media and/or an activity and another party may accept or reject it. Once accepted, the media and/or activity may be available until the sharing party terminates the call or ends the sharing. Conventional mobile computing environments may be adapted to enable rapid, wide-spread adoption of these communication modalities.