Tweet every song you listen to! Lose followers!

gistfile1.txt

var LastFmNode = require("lastfm").LastFmNode,
    twitter = require("twitter");

var lastfm = new LastFmNode({
    api_key: "your_key",
    secret: "your_secret"});

var twit = new twitter({
    consumer_key: 'STATE YOUR NAME',
    consumer_secret: 'STATE YOUR NAME',
    access_token_key: 'STATE YOUR NAME',
    access_token_secret: 'STATE YOUR NAME'
});

var stream = lastfm.stream("your_username");
stream.on("scrobbled", function(track) {
    twit.updateStatus({ status: "I just listened to \"" + track.name \"' });
});
stream.start();

Completely untested. In fact, I just spotted a bug.