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To be honest, i tend to write my own answers but often check google to ensure authentic information is presented. No, i didnt googled to write down this answer :)
Regarding the Answer Editing, Happy are those who finds fault with themselves and then correct them.
Frankly sometimes i do this when the answer is too long and i know that is existed somewhere, and even sometimes i provide the links for the answer it self. and ofcourse most of the time the answer is from my mind.
plus it depends on the question type it self, there is some questions you have to answer it from your mind.
I have seen it both as some times just copy paste some links and some people use thier brains to answer as if you dont know answer then dont answer it as google can provide any information.
but not copy past exactly