I attempted to discuss this issue with some folks over the past couple of weeks. The responses range from "yes, we need more references and citations" to an attitude that they're doing you a favor by posting/sharing any information with you, and they see no reason to post links or citations. If you don't believe it, that's your problem and not theirs.
This creates a problem where trolls periodically send out made-up stories, and it gets copied and spread like wild fire without anyone actually checking/verifying the source. Examples include fake news on South Korean researchers claiming that Mao and Dr. Sun were ethnic Korean.