Ask HN: Have Any HN Clones Gained Traction?

I'm not sure what you mean by HN clones, but there's HN for other communities:

https://growthhackers.com/ http://inbound.org/ http://bootstrappers.io/ https://news.layervault.com/

I've been looking at this question for a while. I think you really have to go niche, by topic or geographic location.

I would love to engage some conversation around how to grow these types of communities.