I've noticed people submit their own blog posts and then don't take any part in the ensuing conversation. What is the point? It feels discourteous to the community - people take time to write their thoughts and the OP can't even be bothered to acknowledge.
Eg. http://news.ycombinator.com/item?id=4921024
I've seen it a few times recently, but sadly I can't find the threads immediately.
By contrast, it's nice to think that a silent OP is reading and trying to learn from the discussion, either modifying their ideas, or thinking about how to better communicate their ideas in the future.