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(This might get good answers on WorldBuilding SE also.) I think you have to decide, from a storytelling viewpoint, how these people communicate. Does each individual have his/her own thoughts but ...
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#3: Attribution notice added
Source: https://writers.stackexchange.com/a/18622 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
_(This might get good answers on WorldBuilding SE also.)_ I think you have to decide, from a storytelling viewpoint, _how_ these people communicate. Does each individual have his/her own thoughts but others pop in and out like everyone is always in the same room and thinking out loud? Do you only hear the thoughts of people within X geographical distance? Or is it more like the Borg, where there's the constant white noise of a billion minds in the background? How has this affected society? Is there an Internet? Are there phones, email, texts, mail? Do people travel as much? Can they link to the point of looking through someone else's eyes, so to speak? Once you work through these structural details, it should become clearer how to tell the story — if you have individuals who think but are always hearing other individuals, that could be first-person or third-person limited, but if everyone is a Borg drone with free will, then third-person will make more sense.