Many of us have probably got tired of clicking those tiny thumbs-up and thumbs-down icons next to the ads that appear on our Facebook home pages. However, the site that is actually implementing changes based on such actions by users is Digg, who have announced that they will charge a lower cost-per-click for ads that seem to go down well with users, and will let them stay up longer. Conversely, those ads that users indicate they dislike will be charged more, and will have less likelihood of a long screen life.

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