"Their" is used as a possessive for "the user" (to avoid gender pronouns like his or hers). "they've": they is a pronoun for "the user" and is a contraction of "they have".
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TakaInitially, I also took it that way, but then, grammatically, doesn't 'the user' have to be 'the users' instead?If there's only one user you are referring to, then you can't say "the users". Assuming you are referring to something like Youtube, the user is probably a member, someone who has an account and the the one who uploaded the video. If you can