Just normal randomness I suppose. I've put that URL at the top now, and included the submitted URL in the top text.
replyThe official blog post was submitted earlier (https://news.ycombinator.com/item?id=46990637), but somehow this story ranked up quickly on the homepage.
reply@dang will often replace the post url & merge comments
replyHN guidelines prefer the original source over social posts linking to it.
Agreed - blog post is more appropriate than a twitter post
reply