That means that post is open to the public to see. If you have your profile settings set to "Friends", then no one will be able to share your posts.
How do I make my Facebook post shareable?
How to Make a Facebook Post on a Page Shareable
- From your Facebook home page, click on Pages on the top of the left menu.
- From the list choose the Page that has the post you wish to share.
- Scroll down the Page wall until you find the particular post. Click on Share on the lower right of the post to share it to others.
How do I fix my share option on Facebook?
How to Change the Facebook Share Setting for Previously Shared...
- Visit your personal timeline and click the Activity Log button directly below your cover photo. ...
- Find the status update for which you want to change the sharing preference. ...
- Click the share icon and choose a sharing option from the list.
