Display "Shortest Route" between users

hi,

is there any way to show up a block or similar, like a php snippet for user_profile.tpl.php, when you are visiting another users profile? e.g. user 1 is friend of user 2, user is friend of user 3, and user 3 is friend of user 4. now, when user 1 visits profile of user 4, a block shows up with the "shortest route" between this users:
user 1 <> user 2 <> user 3 <> user 4

http://drupal.org/project/buddylist2 has this feature and it´s imho very usefull, the description of this module:
"Buddy API Shortest Route provides a block which shows the shortest route from UserA to UserB in a social network (like StudiVZ, Facebook,...)"