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Re:Facebook is storing an updated copy of your phone Contact... by Swizec on Friday March 23, 2018 @04:27PM (#16662359)
You can flag posts. That counts as a downvote (or more).

If I had to guess, I'd say the submission got heavily penalized for being trollbait. Either by the mods, or by the community.

Re:Facebook is storing an updated copy of your phone Contact... by grzm on Friday March 23, 2018 @04:33PM (#16662404)
Flags affect ranking (which might be what you're getting at), but they don't change the number of votes displayed.