How to put Facebook on Codeforces profile?

Правка en2, от I_need_7.0_IELTS, 2023-12-02 10:17:47

I see there are some accounts which shows their Facebook. But I can't find where to do it in Settings. Anyone knows how to do it?

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en2 Английский I_need_7.0_IELTS 2023-12-02 10:17:47 6
en1 Английский I_need_7.0_IELTS 2023-12-02 10:17:32 217 Initial revision (published)