open file /etc/squid3/squid.conf
add these lines:
acl bad_url dstdomain "/etc/squid3/bad-sites.acl"
http_access deny bad_url
then go to /etc/squid3/bad-sites.acl and add domains with this format
.google.com
.msn.com
.app.facebook.com
Ganyan un format gagana kaya yan?