Someone said "nothing was known about X until $date" or words to that effect and I replied with two sources, available online, that spoke about X prior to the date and that it was from my own recollection that I knew the sources existed. The incorrect comment stands and I got the usual "your comment was not complete enough for us". Every now and again I'll post something, especially when there are no responses and I have a source to share -- but I've taken to messaging the OP now instead.
Maybe it's all chaff, but I'm curious to find out.
I like the Slashdot way of having scoring and a slider so you can see it all if you want, and the "boosts" they do so you can see humorous stuff even if others want to see serious stuff. User-level filtering makes much more sense to me.
Occasionally there are gems.
hnflagflyer.com