Netgear block istes

[imagetvr]

I have a Netgear Wireless router model Wpn824v2. I blocked facebook,twitter by using
block sites option. If if type facebook.com it showed message blocked site message but
in google search search link facebook opened. how can i block facebook completly ?

 

[Lee-m]

if you just blocked facebook.com, then facebook.co.uk would still work for example.