The server then determines a friend rank for each of the other users based on the interaction history, wherein the friend rank indicates {HEAD ~ a measure} of {TAIL ~ a degree} of influence the other users have over the first user and stores the friend rank for each of the other users 
The server then determines a friend rank for each of the other users based on the interaction history , wherein the friend rank indicates { HEAD ~ a measure } of { TAIL ~ a degree } of influence the other users have over the first user and stores the friend rank for each of the other users
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH