This may not be a big deal for the most part, but to some, it just might very well be.

By default, iChat exposes your personal information, which is available to any other Mac user via Rendezvous. At home this probably wouldn’t matter, but at work, a conference, or school — well, you might not like other people snooping your info.

Fortunately, the fix is quite easy: Launch iChat and under “Privacy” in Preferences, check the box labeled “Block Rendezvous users from seeing my email and AIM addresses.”

via O’Reilly