I would counter (this is not my original idea but I highly subscribe to it) that HN's up-arrow serves a dual-purpose...'liking' an article and 'bookmarking' it

I would counter (this is not my original idea but I highly subscribe to it) that HN's up-arrow serves a dual-purpose...'liking' an article and 'bookmarking' it for later. There's no other way I can see to explain how articles get 40+ votes on the homepage but only have 5-10 comments on them. If PG would simply add a 'read it later' style link/button to stories, up-arrows would retain their 'like this' purpose and I believe the homepage would have 'better' content on it. I'm guilty of this myself.... I very often will click an up-arrow if I'm viewing the feed and don't have time to open up an individual article so i can use my instapaper bookmarklet on it.