Use firefox or Chrome and add "add-on" or "extension" to block site.
BlockSite :: Add-ons for Firefox
https://addons.mozilla.org/en-US/firefox/addon/blocksite/Cached
BlockSite is an extension, which automagically blocks websites of your choice. Additionally, this extension will disable all hyperlinks to these websites, by just ...
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Website Blocker is useful when you want to concentrate on work.
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In IE, see this one http://www.wikihow.com/Block-a-Website-in-Internet-Explorer-7
