I'm using transparent Proxy and want to restrict social networking site to users.
My squid.conf as follows but not of use unable to stop website

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#Recommended minimum configuration:
acl all src all
acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32
#acl workhrs time MTWHFA 11:00-16:00
#
# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
# should be allowed
#acl localnet src 10.0.0.0/8 # RFC1918 possible internal network
acl localnet src 127.0.0.1/255.255.255.255 # RFC1918 possible internal network
acl our_network src 192.168.2.0/24 # RFC1918 possible internal network
acl bad dstdomain www.facebook.com
#acl blacklist_ip src 192.168.2.11
#
acl SSL_ports port 443 # https
acl SSL_ports port 563 # snews
acl SSL_ports port 873 # rsync
acl Safe_ports port 80 # http
acl Safe_ports port 21 # ftp
acl Safe_ports port 443 # https
acl Safe_ports port 70 # gopher
acl Safe_ports port 210 # wais
acl Safe_ports port 1025-65535 # unregistered ports
acl Safe_ports port 280 # http-mgmt
acl Safe_ports port 488 # gss-http
acl Safe_ports port 591 # filemaker
acl Safe_ports port 777 # multiling http
acl Safe_ports port 631 # cups
acl Safe_ports port 873 # rsync
acl Safe_ports port 901 # SWAT
acl purge method PURGE
acl CONNECT method CONNECT
# TAG: http_access
# Allowing or Denying access based on defined access lists
#
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#Recommended minimum configuration:
acl all src all
acl manager proto cache_object
acl localhost src 127.0.0.1/32
acl to_localhost dst 127.0.0.0/8 0.0.0.0/32
#acl workhrs time MTWHFA 11:00-16:00
#
# Example rule allowing access from your local networks.
# Adapt to list your (internal) IP networks from where browsing
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#http_access allow localnet
#http_access deny bad workhrs blacklist_ip
http_access deny bad
http_access allow localhost
http_access allow our_network
http_access allow localnet

# And finally deny all other access to this proxy
http_access deny all

# TAG: http_access2
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#Default:
debug_options ALL,1 33,2 28,9