Sharing link to something interesting is invitation for discussion. Suppose I am to share a quote from famous philosopher -- my commentary may be considered unimportant or selfish but either way it would be of little value, comparing to what is being shared by someone with superior eloquence and understanding of subject.
Similarly, suppose I'm sharing a link to the song that I liked. What would be more valuable to reader -- discovery of good/interesting content or my redundant commentary?
By the way I think they already put me on blacklist, without much consideration for ethical citation, original commentary, etc.
RE: "Drink salt water now" comedy song (2009) by 3Pod