I don't really like the explicit "reply" chain that's come to be thanks to Twitter's cementing of it. I'm more of a fan of the linking in text and reading from there. The benefit of the reply chain is that you can see all of the content forming the contextual umbrella at once. And when it comes to fast firing off of thoughts, it's more ergonomic than thumbing down a longer blog post or finding your laptop or computer to do so. I know that I'll be incorporating a way to immediately link to what I've posted in my composing tools for my site as well as fetching from my subscriptions because those are the things I'd be writing about.