Using google's URL shortener.

URLShorten

function addLink(msg, from, to){
  var url = msg;
	googleapis.discover('urlshortener', 'v1').execute(function(err, client){
		client.urlshortener.newRequest('urlshortener.url.insert', { resource: {longUrl: url}}).execute(function(err, result){
			var shortUrl = 'Cannot shorten '+url;
			if(err){
				console.log('Shortening error: ',err);
			} else {
				shortUrl = result.id;
			}
			addToLinks(shortUrl, from);
			bot.say(to, 'I might have added '+url+' to recommendations.');
		});
	});
}