grep www /etc/group
(I changed here the real user names to user1 and so on, and the real ibay names to ibay1 and so on.)
shared:x:500:admin,ibay1,user1,user2,user3,user4,user5,ibay2,ibay3,ibay4,user6,user7,ibay5,public,user8,ibay6,ibay7,user8,sysinfo,user9,uucp,ibay8,user10,www
www:x:104:admin
test:x:5009:admin,user1,user2,user3,user4,www
faxmaster:x:5016:admin,user1,user2,www