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To fight against my procrastination I changed /etc/hosts on my Ubuntu (11.10) laptop. The /etc/hosts looks now like
127.0.0.1 facebook.com
127.0.0.1 plus.google.com
127.0.0.1 twitter.com
and many more time-eaters in it!
But if I type now facebook.com in my browser it still works.
Is there a DNS cache or something?
By the way, you can put multiple entries on one line--
127.0.0.1 facebook.com plus.google.com twitter.com stackoverflow.com
etc. – Chris Morgan – 2012-02-18T13:39:00.527