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I have someoene who revisioned or edited my question on Writers, can I give them points for them spending there time to make the edit? I know they get automatic credit for it, but can we give credit to show how 'good' we think the edit is?
There's no mechanism to do this - and members making great edits are doing so more for its own sake than for reputation.
You can ping him in a comment and thank him for the revision.