The new scoring is part of the social network's strategy to show its users more relevant ads.
In an announcement on its website yesterday, the social network said the new metric, which will launch globally this week, was part of a wider strategy to show its users ads more relevant ads.
The relevance score will be based on Facebook users’ reaction to ads, taking into account indicators such as video views and conversions.
Adverts will receive a relevance score of between one and ten, with ten being the highest.
Facebook said that introducing a relevance score will help advertisers test different creative formats before launching a campaign.
It added that the new metric will also be cost-effective for brands: "Put simply, the higher an ad’s relevance score is, the less it will cost to be delivered".