In theory, If you've got multiple people taking photos at the same place with a short period of time, you can get sound media as well.
Though some may suspect they are trying to put together conversations, I doubt that is the case (but maybe if you want to go for a conspiracy theory).
-------------update apparently they are capturing your conversations --------------------
from their homepage "capture photos, videos, and conversations into a group album".
In theory, If you've got multiple people taking photos at the same place with a short period of time, you can get sound media as well.
Though some may suspect they are trying to put together conversations, I doubt that is the case (but maybe if you want to go for a conspiracy theory).
-------------update apparently they are capturing your conversations --------------------
from their homepage "capture photos, videos, and conversations into a group album".