Negative keywords are known as Excluded Words in Yahoo's Search Marketing platform (YSM). See how to use Excluded Words to best effect with this What, Where and How guide.
What match types?
Unlike AdWords negative keywords, which can be assigned a Broad match, Phrase match or even Exact match, Excluded Words cannot be assigned a specific match type. In practice, Yahoo appears to interpret negative keywords using its Standard Match setting. Standard Match expands on keywords to capture singular and plural variations, as well as common misspellings. If you were to add 'free ticket' as an Excluded Word, Yahoo would automatically prevent your ad from showing for any queries that contain either 'free ticket' or 'free tickets'. While than can save time, it does prevent you from excluding only singular or plural variations on your keywords.
Where?
You can add Excluded Words only at the account level (under the Administration tab) and the ad group level (from the Ad Group settings page, under Tactic Settings) - however, Yahoo will not allow advertisers to set negative keywords at the campaign-level. Excluded Words set at the account level work across all campaigns and ad groups. Excluded Words set at the ad group level work hand-in-hand with account Excluded Words
How many?
You can add up to 250 Excluded Words both at the account and ad group levels. In practice, a Yahoo ad group can hold up to 500 negative keywords. This is significantly more than adCenter, yet below AdWords limits.


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