One of the most useful PD forums on Facebook (which "shares news about PD research and facilitates discussion between researchers, scientists and patients") demands a simple courtesy of those who join the group.
Rather than regularly littering the forum pages with links prefaced with little more than vague allusions as to what the link may (or may not) lead to, they ask that those posting a link take a moment to "explain why you are sharing a link, 'you might be interested' or 'have you seen this' does not credit the fact that you have actually read the post and thought about it enough to find it an important topic to discuss".
They also request that members "try and use "quotation marks" if you are directly quoting someone so that the source of ideas is acknowledged."
A brief explanation as to "why you are sharing a link" - together with one or two pertinent quotes to summarize the heart of the issue presented - allows others a more informed decision as to whether the posted link is of personal interest to them.
What a radical concept!