I think the most appropriate way is to enclose contents from other websites/posts by "quote"
Not only the visualization via "quote" I think - there should be the link to the original site nearby. Moreover: links should lead to direct sources (to the pages of original articles, for example). Some spamers use the "quote" option but never adduce the proper links (placing the abstract sentences like "source: bitsmedia.com" at best
as informative as "source: google.com").
Right that's what I had in mind, for quotation for another user's post, the correct "quote" comes with the link to the post automatically, but for the contents from the external website, the link to the specific source is necessary. Edited my post above.