To make a Facebook post shareable, you must set its audience visibility to Public. This can be done for new posts when creating them or for existing posts by editing their privacy settings.
To make a Facebook post shareable, set privacy to Public, create engaging content, add compelling visuals, use call to action, include hashtags, keep messaging valuable, emotional or informative, and encourage interaction through questions or captions that inspire users to share.
Setting your post's audience privacy to Public either before or after posting is crucial. Select Public (globe icon) when creating a post by tapping the audience selector (which may say "Friends" or "Public"). This maximizes the reach of the Share button by enabling anyone on Facebook to view and use it.