1. Hmm, I guess I can use this to hide posts that I would just get really angry about and just want to get out of my sight. I suppose it must be a mental health feature, the Californians are really into that that these days.
2. Hmm, I guess I can use this to hide uninteresting stuff and then also get new, potentially interesting stuff on the front page.
Presumably people smarter than myself went to #2 immediately...
So maybe?
Dang added it a while ago. It was supposed to help quell some of the rancor around here, and complaints about certain stories not being "HN worthy," etc. But this place is also subject to heavy feature-blindness so maybe not a lot of people noticed it.