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Mysterious billboards are a thing now, I guess.
The latest one getting national attention is on Interstate 69 in Flint, Mich. White letters set against a blue background read: "I'm concerned about the blueberries." Well, sure, aren't we all? Michigan is a big blueberry producer, but local groups engaged in that business claim they're not behind the cryptic message, and CBS Outdoor, which owns the billboard, says it was posted anonymously and won't say more.
Theories abound.
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