I think the poor adverts are because of the lack of content on the page (100 words max). For example, one of the sites is a security services directory - title, keywords, description, URL and the small bit of textual content reflect security services but the ads are a mixture of some security stuff and some randoms.

When i go onto Yahoo and search "security services" there are plenty of relevant ads so i know they do have the inventory.

Can anyone give me some advice on what Yahoo uses to asses ad relevance?

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