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From TipperWiki
StumbleUpon is any social bookmarking service that is allows you peruse through random websites also documents or those within any particular category. If you appear across a web site you don't for instance, you can prevent it to suppress its content from showing upward while you are stumbling. You can then remove the blocked domains from your environments page. Unfortunately, you cannot manually add domains by way of the environments page.
Difficulty: Uncomplicated
Instructions
3 Click "Stumble" frequently to scan the web site. When you arrive on some website you desire to obstruct, click the arrow beneath the "Thumbs Down" icon on the top navigation bar.
6 View your blocked websites underneath "Run Blocked Domains." Click on some domain if you desire to remove it out of the blocked list. Click "Remove."
References
StumbleUpon: Rating on StumbleUpon
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