To make a Facebook post shareable, you need to adjust its privacy settings. When creating or editing a post, click the audience selector (usually says “Friends,” “Only me,” etc.) and choose Public. Only posts set to Public can be shared by others. Posts set to Friends, Only Me, or custom lists cannot be shared outside the selected audience. After setting it to Public, publish the post, and other users will see a Share button below it, allowing them to repost it on their timeline or in groups.