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http://askubuntu.com/questions/180941/blocking-multiple-sites-with-etc-hosts http://jaxov.com/2009/09/how-to-block-websites-in-ubuntu-linux/ hosts example127.0.0.1 localhost 192.168.1.199 UbuntuServer 0.0.0.0 r.twimg.com 0.0.0.0 p.twitter.…