giving citation to the original owner of the content should be done properly like for social media for instance, a link should be dropped that redirects people to the original articleYou are actually talking about citation, given credits to the original poster on quoting his write up. This is not plagiarism or any other form illegal copywriting,it's is recommended globally make a citation after quotation.
That's citation if am get what you mean by saying quote. It's actually accepted worldwide to make a citation referring to the original source of the quoted write-up.