Yeah the facebook book IM bar has been hit and miss. It was working for about 20 minutes a couple days ago and hasn't worked since.
Its a great tool to tie the DJ's together on the site and keep traffic on the site for longer periods of time. The longer people are logged on the more the numbers hold and grow. Also the longer users are on the site the more likely they are to click on a banner, add new material, blog more and post more events and news.