I used to use an online tool called Joule to track who had added me and how long I had certain friends on LJ -- that tool is apparently gone. I think I have had Mark in the UK as a friend for nearly this entire ten years as well as Erika up north in awesome Canada.
The state of my LiveJournal is a good indicator of how I live in general. I perpetually swear that I am going to finish my mood icon set but never have, I always think that I am going to get a set updating schedule but never do, etc. I hope this changes in the future.