title: Socket.io server can't broadcast to room
body: <pre><code>io.on("connection", function(socket){ 
      ...
      socket.on("join", function(id){
          socket.join(room);
          socket.broadcast.to(room).emit("joined", ...);
          ...
      });
      ...
  });
  </code></pre>
  
  <p><code>socket.broadcast.to(room).emit("joined", ...);</code> haven't any effect
  it doesn't emit to the room the event</p>
  
  <p>i've already tried to use:<br>
  <code>socket.to(room).emit("joined", ...)</code><br>
  <code>socket.in(room).emit("joined", ...)</code>
  <code>io.sockets.in(room).emit("joined", ...);</code><br>
  <code>io.to(room).emit("joined", ...);</code><br>
  <code>io.in(room).emit("joined", ...);</code></p>
  
  <p>i'm using socket.io server v1.3.7</p>
  
  <p>any solution?</p>