Other Bitcoin communities?

Are there any other Bitcoin communities that people frequent? Reddit-based or otherwise.

I probably come to r/bitcoin most often but also r/cryptocurrency and also occasionally dip into r/BitcoinMining (I don't mine and the vast majority of stuff on there I don't understand and is often technical stuff, but occasionally there are threads on the general market and the bitcoin economy which is really interesting to see from a miner's perspective)

I even also dip into 4chan /biz/ - again it's interesting to see the crypto markets and bitcoin from a different perspective.

Any others that people find useful/insightful?