I tried making 3 lists, much as Mark Cuban recommends - Mark Cuban's Layers of Facebook Friendship might be a way to define Friendship in a Social Network, but I don't know how useful, yet, this set of lists will be.

And in some cases, I have friends I put in more than one category  and some that I somehow didn't put in any category or list.  According to ReadWriteWeb - Facebook Launches Friend Lists - Still Not Ready for Business, the capability to create lists is useful but not really enough:

"…We had hoped that Facebook would not only let you group friends, but also specify privacy settings based on those groups. I.e., you could put coworkers in a group that could only see your contact and bio information and send you messages, but not see your wall or photos. Then friends could be put into a separate group that could do potentially damaging (to your business reputation) things like see and share photos. Even better, groups could be used to more finely tune privacy settings, such as hiding a specific photo or album from a single group."

Here's what a Facebook list looks like according to Read/WriteWeb: