Editing WoW:API IsReferAFriendLinked (section)

== Example ==
 function HasRecruitAFriendBonus()
     local numPartyMembers = GetNumPartyMembers();
     if numPartyMembers > 0 then
         local memberID = 1;
         while memberID <= numPartyMembers do
             if GetPartyMember(memberID) == 1 then
                 local member = "party" .. memberID;
                 if UnitIsVisible(member) and IsReferAFriendLinked(member) then
                     return true;
                 end
             end
             memberID = memberID + 1;
         end
     end
     return false;
 end