One of the great music videos of all time is Madonna’s Material Girl. With two exceptions, all the “related videos” listed by YouTube are just what one would expect: either other Madonna videos, or other versions of Material Girl. One exception is Cyndi Lauper’s Girls Just Want to Have Fun, while the other is Marilyn Monroe’s Diamonds Are A Girl’s Best Friend. The connection with the Monroe video is particularly strong, with each being #3 on each other’s “Related” list.
And that’s an outstanding result. Material Girl is obviously a direct reference, conceptually and visually, to Diamonds Are A Girl’s Best Friend. So my question is: How does YouTube know that? Are there favorite videos lists on which they co-exist? Did somebody hand-enter the connection? Is it inferred from their comment threads (which I definitely have not paged through)? Or — by far the least likely but most interesting of all — is there some sort of direct visual comparison?
Other than popularity presumably having something to do with it (both videos are, deservedly, very often watched and commented on), I haven’t figured out which it is.