Short notes means they have been processed and elaborated and readable for themselves and for eventually others in the future.
Discussion
I love this. Short, doesn't mean terse and cryptic. A good reply should use complete sentences and contain enough context that one doesn't have to review the thread to comprehend it.
Precisely.
I'm also in favor of threaded conversations, as you have to tease out your arguments point-by-point, and people can reply to and quote individual points.