Slashdot has "friend" and "foe" icons, and second-degree icons, like "friend of friend", etc. I don't think we're quite to the level of needing those yet, but it's an interesting system.
As I don't have any friends or foes on slashdot, I use "friend" to be a user who has posted something interesting, and "foe" to be a slashdot administrator.
__________________
_________________
|...............| We live in the nick of times.
| Len 17, Wid 3 |
|_______________| [pics]
|