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Has there been any progress since then? The blog has been awfully quiet.

Yes! Phoenix creator here. We need to give the blog some love, but in 2015 we had a big year. We released the "Programming Phoenix" book for pragprog and our big "Phoenix Presence" feature, a CRDT backed eventually consistent process group:

https://dockyard.com/blog/2016/03/25/what-makes-phoenix-pres...

We also have been working on Phoenix 1.3 which I laid out in my ElixirConf keynote. Ask me anything!

What does presence use for its persistence layer? For its gossip protocol? Are you using plumtree, a fork, or something home rolled? Are you aware of Christopher's work with Lasp and the delta-CRDTs?

This sounds great and it's very idiomatic to OTP, it's like a web app VM.

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