title: Scale-able chat-room using PHP/MySQL?
body: <p>Forgive the lack of a question. 
  I'm trying to build a website with the same functions as a chat room. The idea of 5-50 viewers in each room (with thousands of rooms) is very real, only about 1% of the room would be chatting. </p>
  
  <p>I've had some ideas, but everything I've come up with seems like it would require a crazy amount of processing power...  What would be an efficient way to do this?</p>