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I always thought circles were for some kind of voice chat real time podcast thing?

And people could just join them at-will without any moderation.

But I'm not a heavy twitter user in the least :)

Circles were a near-exact lift of the same-named feature from Google Plus. You could (can still?) set up ring privilege layers of your followers or specific subgroupings and send tweets only visible to those in that group.

That's Spaces.

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