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CNN is precisely the journalism niche they are talking about.

It isn't about niche celebrities, but celebrities as a whole is their niche. And journalists, of course. Newspaper websites publish vast quantities of tweets because it costs them nothing, it means you indirectly consume a lot of tweets.

But the celebrity content consumed by journalists is as a whole still a niche, even if all celebrities are on there.

FWIW I think it would be a mistake to abandon that, but it does raise questions about how they grow.