I'm not familiar with Twist but from a quick glance I don't see a similar function. Wave let you post a reply in the middle of someone else's message, so that

I'm not familiar with Twist but from a quick glance I don't see a similar function. Wave let you post a reply in the middle of someone else's message, so that if you were presented with a whole list of questions you could answer each of them inline, and other people could tag on to those new conversation threads in place.