This is actually insanity.

Most of you are on FB and you are here as well. So why create another space to converse? Is it because FB has a potential to do it better than anyone else? I'd say yes and no. Yes because it has largest user base. No because they are testing features and there are many other services which has done lot better in organizing, facilitating group conversations.

Either case, the HN group and many other such popular groups showing up at FB, only tells one thing: it is going to be a huge hit. How it gets adopted later, like how Twitter Lists did, only time will tell.