Please don't pump links into threads like this. It's overly aggressive, and it damages conversation. I've explained more at https://news.ycombinator.com/item?id=23195282.

One reason we have to be careful about not allowing it is that we let some people do it, it will lead to a flood of promotional comments, which would definitely not make this place better.

I've detached this subthread from https://news.ycombinator.com/item?id=23192337.