However, doesn't this "IsFamous" label break down when multiple famous people share a name. No obvious example spring to mind, but it surely must happen...
Seems like it would be more useful to have some kind of more general labelling system, where you could be 'verified' as (say) a famous actor, and/or musician, or whatever. Then people could distinguish not only the famous Matt Smith from the unfamous, but also the painter Matt Smith, and so on.