In Address Book, I see a contact with "Smiley" face lighted but the same contact in my IM list is not lighted.

They can also be logged into their email account, but just not logged into IM.

In Address Book, I see a contact with "Smiley" face lighted but the same contact in my IM list is not lighted.
invisible
Reply:If the face is lighted in your adressbook it means that person is online.If that person shows offline on IM it means they are on""appear offline"'meaning they're there,just not in the mood of chatting.
Reply:Maybe they logged into IM in invisable mode