Enable subscribers on Facebook Profile
Step 1: Go to your Facebook page.
Step 2:Click on the Down arrow on the right top of your page and click Account Settings
Step 3:From the left side menu click on Subscribers tab.
Step 4:Now checked the box for allowing subscribers.
You are done. Now people will able to subscribe to your public updates. If you would like to share anything for everyone on post then select privacy for Public and you can see your subscribers count on your Timeline profile and also able to see how subscribers you have from subscribers list.