A computer implemented method of matching {TAIL ~ users} to {HEAD ~ other users}, the method comprising: 
A computer implemented method of matching { TAIL ~ users } to { HEAD ~ other users } , the method comprising :
OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH