ChatterBox is an outside service, and as such doesn't tie into our user signin system.  As a result, it's possible for anonymous visitors to comment without leaving their usernames.

ChatterBox does record a portion of the IP address of the person leaving you a comment.  For more information on what this means, please see:

What is an IP Address?
http://help.xanga.com/whatisanipaddress.htm

One last note: unfortunately, because we don't know who these visitors are, the Xanga Block feature won't work.  If you're being harassed or stalked in your Chatterbox, we strongly recommend you delete the Chatterbox.  You can do that here:

How do I delete my ChatterBox?
http://help.xanga.com/deletechatterboxmodule.htm