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Not sure why you would have been down-voted for that question.

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".

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