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Originally, medium was the singular and media the plural. (Note that medias as a plural is incorrect.)
However, usage is evolving. While we still use the Latin plural media in expressions like news media or mass media, it has become acceptable to use mediums as a plural in other contexts.
In the case of clairvoyants and clothing sizes, the only possible plural form is mediums.
When used in reference to the news media, the term media has become a collective noun in English and can take either a singular or a plural verb.
If the writer is thinking of the media as a unit, a singular verb is used.
If the writer is thinking of the media as a collection of individual mediums, a plural verb is used.
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