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Look at the following sentence that I just saw while viewing a profile:

Apparently, this user prefers to keep an air of mystery about them.

As it looks, them refers to this user, right? This user refers to one person; however, the pronoun them is used which refers to many people and seems incompatible.

Can somebody explain why this sentence is right and why him/her aren't used?

marked as duplicate by Peter Shor , sumelic, choster, Community Sep 13 '15 at 20:18

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