There should be a policy, or strong norm, of "No summary, no link" when starting a thread with a suggested link. That summary should tell the key insights gained, and what about it you found unique.

I hate having to read a long article -- or worse, listen to a long recording -- and find out it's not much different from what I've heard a thousand times before. (That happens more than I would expect here.) Of course, you shouldn't withhold a link just because Silas (or anyone else) already read something similar ... but it tremendously helps to know in advance that it is something similar.