A method for transmitting content from a user computing device to at least one recipient computing device (20, 24, 28), the method comprising: displaying to a user of the user computing device a plurality of avatars, wherein each of the avatars represents a different recipient, and each of the different recipients is associated with a different recipient computing device (20, 24, 28); establishing a group communication session among the user computing device and each of the different recipient computing devices (20, 24, 28); and during the group communication session: transmitting initial content from the user computing device to each of the different recipient computing devices (20, 24, 28); determining that the user of the user computing device is gazing at a selected avatar of the plurality of avatars; based on determining that the user is gazing at the selected avatar, establishing a private communication session between the user computing device and the recipient computing device that is associated with the selected avatar; and during the private communication session, transmitting subsequent content from the user computing device to the recipient computing device associated with the selected avatar while not transmitting the subsequent content to the one or more other recipient computing devices associated with the one or more other avatars of the plurality of avatars, wherein the initial content comprises initial audio data representing speech of the user captured by the user computing device and the subsequent content comprises subsequent audio data representing speech of the user subsequently captured by the user computing device, and characterized in that the method further comprises modifying the subsequent audio data representing speech of the user to make it audibly distinct when producing audio output as compared to the initial audio data representing speech of the user when producing audio output to indicate to a recipient that the content is exchanged as part of the private communication session. displaying to a user of the user computing device a plurality of avatars, wherein each of the avatars represents a different recipient, and each of the different recipients is associated with a different recipient computing device (20, 24, 28); establishing a group communication session among the user computing device and each of the different recipient computing devices (20, 24, 28); and during the group communication session: transmitting initial content from the user computing device to each of the different recipient computing devices (20, 24, 28); determining that the user of the user computing device is gazing at a selected avatar of the plurality of avatars; based on determining that the user is gazing at the selected avatar, establishing a private communication session between the user computing device and the recipient computing device that is associated with the selected avatar; and during the private communication session, transmitting subsequent content from the user computing device to the recipient computing device associated with the selected avatar while not transmitting the subsequent content to the one or more other recipient computing devices associated with the one or more other avatars of the plurality of avatars, wherein the initial content comprises initial audio data representing speech of the user captured by the user computing device and the subsequent content comprises subsequent audio data representing speech of the user subsequently captured by the user computing device, and characterized in that the method further comprises modifying the subsequent audio data representing speech of the user to make it audibly distinct when producing audio output as compared to the initial audio data representing speech of the user when producing audio output to indicate to a recipient that the content is exchanged as part of the private communication session. transmitting initial content from the user computing device to each of the different recipient computing devices (20, 24, 28); determining that the user of the user computing device is gazing at a selected avatar of the plurality of avatars; based on determining that the user is gazing at the selected avatar, establishing a private communication session between the user computing device and the recipient computing device that is associated with the selected avatar; and during the private communication session, transmitting subsequent content from the user computing device to the recipient computing device associated with the selected avatar while not transmitting the subsequent content to the one or more other recipient computing devices associated with the one or more other avatars of the plurality of avatars, wherein the initial content comprises initial audio data representing speech of the user captured by the user computing device and the subsequent content comprises subsequent audio data representing speech of the user subsequently captured by the user computing device, and characterized in that the method further comprises modifying the subsequent audio data representing speech of the user to make it audibly distinct when producing audio output as compared to the initial audio data representing speech of the user when producing audio output to indicate to a recipient that the content is exchanged as part of the private communication session.