Is it possible to "transfer" the +1 Like from a WP post to the same post on Facebook?

It is impossible to do it, because Like for a WordPress site is a Like of a certain URL, but not the page content, and vice versa.

For more data on the "Like" button, please check the developers' page.

This article related to Like & Share by BestWebSoft plugin

Additional resources: Like & Share - User Guide

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