[1] Who to follow is up to you . [2] It is up to you to decide who to follow . Both are correct and have roughly the same meaning.
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[1] Who to follow is up to you.
[2] It is up to you to decide who to follow.
Both are correct and have roughly the same meaning. In [1] the subject is the interrogative infinitival clause who to follow. In [2] the dummy pronoun it is subject and who to follow is the interrogative clause, just as it is in [1