How to put Facebook on Codeforces profile?

Revision en1, by I_need_7.0_IELTS, 2023-12-02 10:17:32

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?

https://i.ibb.co/T4XCytK/Screenshot-29.png

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  Rev. Lang. By When Δ Comment
en2 English I_need_7.0_IELTS 2023-12-02 10:17:47 6
en1 English I_need_7.0_IELTS 2023-12-02 10:17:32 217 Initial revision (published)