[ubuntu] Easy way to ban a few websites? Had poor experience with dansguardian.

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http://ubuntuforums.org – Hello, I need to stop people using my laptop running Ubuntu 12.10 from going to just a handful of domains. I installed dansguardian using the instructions here http://ubuntuforums.org/showthread.php?t=207008 However, it was a disaster. It filtered most of the websites I use - like Bank of America or Amazon.com - but not any of the Google sites. I never figured out why. Posting to the dansguardian mailinglist and waiting 3 days was not helpful. Didn't get a single reply. So I uninstalled using instruction here: http://ubuntuforums.org/archive/index.php/t-311089.html. My question: (Hardware)