title: Is rethinkdb suitable for a chat application
body: <p>I saw that rethinkdb has real-time capabilities which made me think it would be great for a chat application - however I saw the caveat in the rethink website that says apps requiring high write throughput should consider riak instead.</p>
  
  <p>What is this limit for write that it is mentioning, and is it still suitable for a standard chat application that would support many thousands of concurrent users?</p>