How do you manage your friends in your messenger list?

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Put them under "Friends", "Officemates", "Classmates", "Boardmates", or perhaps "Exes", "Human Rights Advocates", "Haters/Posers", "Cat Lovers", or just plain "Lovers"? I didnt use to put titles on my Yahoo! Messenger list, just the usual "Friends", served its purpose up until high school. But during college, I got confused which "John" is John, the college friend one or the high school one? hehehe I currently have "Friends" which includes my high school friends and my cousins, "College Friends", "Online Friends" those who I met online, "Friends of Friends" those who became my friends because of cousins or a mutual friend, those who went to the same high school but different year level as I was, and the brothers and sisters of my "Friends" who just added me as a friend just for fun. Of course I have this list whom only a handful of people are in. These are the ones who Id make myself available for and drop what I was doing (if I can afford to.LOL!) just so we could talk especially when there is a concern for something. Anyway, what about you? What instant messenger do you use? how do you manage your messenger list? What do you put in the titles? or perhaps you have your own way of discerning your friends? Thanks!^_^