jetpack_tweet.js

// set your twitter id and passowrd
var twitter_id = 'foo'
var twitter_password = 'bar'
var tw = new jetpack.lib.twitter.Twit(twitter_id, twitter_password)

jetpack.statusBar.append({
  html: '<img src="http://assets1.twitter.com/images/favicon.ico" />',
  width: 20,
  onReady: function(widget){
    $(widget).click(function() {
      var w = jetpack.tabs.focused.contentWindow
      var text = w.prompt('tweet')
      if (text) {
        tw.tweet(text, null, function() {
          jetpack.notifications.show('updated')
        })
      }
    })
  }
})