Yup, use of whom in a guy's profile correlates with 31 percent more contacts from the opposite sex. Why would use of whom matter? Presumably because it's associated with more intelligent use of ...

In practice, I would say: 'The girl you described as smart has failed the exam', but that's because I'm not sure if I should use 'who' or 'whom'. In conversational English, 'in practice' as you ...