Both are correct. The word "on" is used when the book is the subject of the sentence and the word "in" is used when the book is an object in the sentence.
Both are correct. The word “on” is used when the book is the subject of the sentence and the word “in” is used when the book is an object in the sentence.
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"on facebook" is the correct form.
“on facebook” is the correct form.
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