Shares on Facebook are similar to retweets on Twitter.
If someone likes content that you have posted on your profile, it is possible for them to share your comments, pictures or posts on their own timeline.
Encouraging people to share your content is a great way to build interaction and extend the reach of your posts with a wider audience.
In order to make sharing possible, you'll probably need to alter your privacy settings.
• You can change privacy settings on an individual post that you want to make shareable by clicking the "Privacy" icon next to the post time stamp and selecting either "Friends" or "Public."
Select "Friends" if you want friends to be able to share the post or select "Public" if you want anyone to be able to see the post.
• You can change your privacy settings for future posts by clicking the drop-down arrow in the top right corner of Facebook and selecting "Settings" and then "Privacy."
Click "Who can see your future posts" and select "Friends" to make all future posts shareable by your friends, or "Public" for anyone on or off Facebook.
You can change this setting at any time by revisiting the Privacy section.