A rewrite of https://gist.github.com/vanrysss/f4c12a249f2adba6c2bc

gistfile1.js

var stream = Tw.stream('statuses/filter', {
  locations: portland,
  language: 'en'
});
var fn = rateLimit(1, 5000, function(msg, username) {
  console.log("emitting!");
  io.emit('stream', msg, username);
});
io.on('connection', function(socket) {
  console.log('new connection');
  socket.on('disconnect', function() {
    console.log('user disconnected');
  });
});
// When a Tweet is recieved:
stream.on('tweet', function(tweet) {
  if (tweet.geo) {
    if (parseFloat(tweet.geo.coordinates[0]) < portland[3] && parseFloat(tweet.geo.coordinates[0]) > portland[1]) {
      if (parseFloat(tweet.geo.coordinates[1]) < portland[2] && parseFloat(tweet.geo.coordinates[1]) > portland[0]) {
        // Makes a link the Tweet clickable
        console.log("tweet");
        tweetQueue.push(tweet);
        if(tweetQueue.length >0){
          rateLimitEmit();
        }
      }
    }
  }
});
var rateLimitEmit = function() {
  console.log("rateLimited Emit called");
  var turl = tweetQueue[0].text.match(/(http|https|ftp):\/\/[^\s]*/i);
  if (turl !== null) {
    turl = tweetQueue[0].text.replace(turl[0], '<a href="' + turl[0] + '" target="new">' + turl[0] + '</a>');
  } else {
    turl = tweetQueue[0].text;
    console.log("emitting tweet");
    //call rate-limited function.
    fn(turl, tweetQueue[0].user.screen_name);
  }
};