You did say "no comments", which is ambiguous between "no description of the link" and "not open for further comments by others". A link without context is bad UI, you need to click it to find out if it's worth clicking. So it's only worthwhile if the other side of the tradeoff has more weight, such as it being a problem that people more rarely post links because of the inconvenience of needing to write a description (as is proper according to the local norms).