Facebook Introduced the Subscribe Button
Now, using Facebook subscribe you can hear from people you’re interested in, even if you’re not friends. Allowing subscribers is a simple way to broaden your conversation on Facebook, while reserving personal updates for people you know well.
After you allow subscribers, a Subscribe button will show up on your profile. Your public updates will appear in people’s News Feeds once they click this button. Only people who allow subscribers will have a Subscribe button on their profile. If you don’t see the button, you can’t subscribe.
Subscribers can see only the things you share publicly. They can also choose how many and what types of these public updates they get.
How to allow subscribers?
Go to this link to allow subscribers for your Facebook profile. Just click the Allow Subscribers to activate it. Or you just go to your Facebook profile page and click the Subscriptions on the left side of the page and click Allow Subscribers.