Crie os arquivos em /etc/squid:

a) "block-hosts.reg" e ponha:

^a\.
^ad\.
^adfarm\.
^ads\.
^ads1\.
^al\.
^as\.
\.msads\.net$
^ss\.
^sa\.
^sm6\.
^tracking\.
adserver.adtech.de

\.belstat\.be$
^metrics\.
\.metriweb\...$
\.metriweb\....$

\.playboy\.com$
\.hln\.be$
^sm6\.
^tracking\.
adserver.adtech.de

\.belstat\.be$
^metrics\.
\.metriweb\...$
\.metriweb\....$

\.playboy\.com$
\.hln\.be$
side6
warez
porn
amateur
anus
asscheck
assfuck
asshole
astalavista
bestialitybuttock
cumshot
cyberspice
cybervixen
hardcor
pecho
pederasta
pederastia
pederastia
pedo
pedofil
pedophilia
pee
peepshow
penthousemag
perra
persiankitty
pica
picha
pimp
pimp
pixxxcity
playbabe
playboy
playmen
playware
polla
poop
porn
prick
pussy
rapist
rated-x
rectum
sadomasochism
sadomasoquismo
shaf
shavedsluts
shit
sizzle
skinmag
slut
smeggy
smutland
snatche
sordid
thehotzone
threesome
voulezvous
xpics
xxx
zoofilia
zoophilia
(inclusive referências em pt_BR)


b) crie agora "block-path.reg":

.ad[ep](\?.*)?$
\.ba[st](\?.*)?$
\.chm(\?.*)?$
\.cmd(\?.*)?$
\.com(\?.*)?$
\.cpl(\?.*)?$
\.crt(\?.*)?$
\.dbx(\?.*)?$
\.hta(\?.*)?$
\.in[fs](\?.*)?$
\.isp(\?.*)?$
\.lnk(\?.*)?$
\.md[abetwz](\?.*)?$
\.ms[cpt](\?.*)?$
\.nch(\?.*)?$
\.ops(\?.*)?$
\.pcd(\?.*)?$
\.p[ir]f(\?.*)?$
\.reg(\?.*)?$
\.sc[frt](\?.*)?$
\.sh[bs](\?.*)?$
\.url(\?.*)?$
\.vb[e](\?.*)?$
\.vir(\?.*)?$
\.wm[sz](\?.*)?$
\.ws[cfh](\?.*)?$

c) ponha agora em "squid.conf":

# Filtros diversos
acl block-hosts dstdom_regex -i "/etc/squid/block-hosts.reg"
http_access deny block-hosts

acl block-path urlpath_regex -i "/etc/squid/block-path.reg"
http_access deny block-path


Agora fuçe à vontade para ver a melhoria na filtragem de seu squid...