&gt; Personally, I find that Facebook has become my address book<p>Before disappearing into outer space (leaving Facebook) I found that Facebook had become my address book.<p>I think that is Facebook&#x27;s greatest use: a self-updating address book. Instead of all my friends having to update their address books when I make a change, I should update my contact info and the changes should automatically be available to them. It&#x27;s a great idea. Now, we just have to make it happen outside of a closed system.