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You can block sites that are advertsing in that way from the adsense control panel. Its not so bad if the people placing the adverts use a ECPM higher than the minimum of 15p or 15 cents.
That means it shares out 15p for every 1000 impressions on a site. Basically if you have a forum with 1000's of users it might be worth it, otherwise its just a very very bad thing.
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I have become death, destroyer of worlds.
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