In Fathom Analytics’ new Relationship Quality Index, the top-rated brands on Facebook tend to be the ones with the most likes. YouTube (48 million likes), MTV (29 million), Coca-Cola (36 million), Starbucks (26 million) and Disney (29 million) make up the top five. But because of other factors, such as engagement and emotion, those brands don’t fall in precise order of fan counts.

Fathom Analytics, a subsidiary of social-media analytics firm Motivequest, bases its rankings on four factors that get equal weight: The brand pages’ number of fans, their momentum (based on how quickly they’ve been acquiring fans lately), fan engagement (or how often they post on or interact with pages) and emotional quality (or how much and how positive emotion is expressed on comments).

(From AdAge)