title: Why does Redis have Pub/Sub capabilities?
body: <p>Why does <a href="http://redis.io/topics/pubsub" rel="noreferrer">Redis</a>, a datastore, have <a href="http://en.wikipedia.org/wiki/Publish/subscribe" rel="noreferrer">Pub/Sub</a> features? My first thought is that it's the wrong layer to implement such a thing. But maybe I need to think outside the box.</p>