For me, the key to this design challenge was the group activity. That variable seemed to have quite a big impact on the overall learning environment workflow, as well as the types of feedback that would make sense.
I opted for a collaborative activity via which a group is tasked with discussing and coming up with an idea for a class project. After receiving instructions for the activity, the group takes to Twitter for the discussion. The first form of feedback comes from peers in the natural back-and-forth evaluation of ideas as they are tossed out.
Once the group has decided on their idea, the conversation is Storified (captured as a coherent, linear narrative) and shared as an artifact embedded in a blog post. Note that I actually think of this artifact as an information source, although it could also be seen as a captured dialogue or even a form of practice. Placed inside a blog post, the Twitter conversation can now receive outside — instructor or other peer — feedback in the form of blog comments or additional Twitter posts.
Finally, because this is a living, dynamic artifact, it can be part of each participant’s ongoing connection to networks outside the class cohort and be part of extended dialogues.