Tweeter with Event Machine - from http://rubylearning.com/blog/2010/10/01/an-introduction-to-eventmachine-and-how-to-avoid-callback-spaghetti/

twitter_stream.rb

require 'rubygems'
require 'eventmachine'
require 'em-http'
require 'json'
  
EM.run do
  username = "username"
  password = "secret"
  term = "ruby"
  
  
  buffer = ""
  http = EM::HttpRequest.new("http://stream.twitter.com/1/statuses/filter.json").post({
    :head => { "Authorization" => [username, password]},
    :query => { "track" => term }
  })
  http.callback do
    unless http.response_header.status == 200
      puts "Call failed with response code #{http.response_header.status}"
    end
  end
  http.stream do |chunk|
    buffer += chunk
    while line = buffer.slice!(/.+\r\n/)
      tweet = JSON.parse(line)
      puts
      puts tweet['text']
      puts
    end
  end
end