Account created a day ago. Is it really Jan Koum?
We detached this subthread from https://news.ycombinator.com/item?id=14260565 and marked it off-topic.
We can't expect him "to tweet his HN-Name" for verification. He could, though I expect him to have strong opinions on things in general (leading to quickly reject a lot of (wrong) paths)
Or doing the PR part
(Which is talking to ppl on HN ofc ;)