4

or is it done manually?

I've noticed an answer on one of my earlier posts which missed references has properly been updated with reference links by the Community♦

Is this an intelligent bot searching Google for matches or some good soul cleaning up answers?

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7

That is an edit by an anonymous user. Anonymous users can suggest edits to older posts, but those edits have to be approved by a high-rep user. Those edits show up as edits from the community user.

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