Like Google AdWords quality score shows a 1 to 10 score to advertisers, now Facebook is doing that for their ads.
Facebook announced they are showing “relevancy scores” on an ad by ad basis to advertisers. The relevancy score is based on the “positive and negative feedback expected an ad to receive from its target audience.”
By positive or negative feedback they mean views, conversions, clicks, comments, likes, etc etc.
Here is a picture of what the score may look like:
Facebook added:
Forum discussion at WebmasterWorld.