I answered a question today with knowledge I have from experience. To delve further into the topic I did some research and found a very good article to support my answer and give deeper information to the question. So, I updated my answer with a link to the article.
I hate broken links so I considered copying the text from the expert's site into my answer with full disclosure that it was his work, not mine - as well as a link back to where I got the text from. (just in case the link disappears in the future)
Is this OK? I know links get shared all the time, but is it crossing a line to copy the whole article (few paragraphs) into my answer even if I credit the source with original link? What is the general rule on the internet for copying and pasting and crediting sources. How about the stack overflow best practice of the same?
Here is the question/answer for reference.