Who can see your posts on Facebook
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When someone clicks Share below your post, they aren’t able to share your photos, videos or status updates through Facebook with people who weren’t in the audience you originally selected to share with. Only the people who could see those posts when you first made them are able to see them when someone clicks Share. Use the audience selector to adjust who you share posts with.
Note: When a friend shares a link that you posted, they can share the link with a wider audience than you originally shared it with. Keep in mind that any text you added in your post will not be shared.