This is the most common and effective method to collect subscribers. Fans are incentivized to subscribe to your page to earn points and win prizes.
To get started you need
A Campaigns subscription. If you're unsure what your subscription includes, please contact your account manager or email@example.com
Connect a Facebook page first
How to collect subscribers with Campaigns
Follow these steps to create a Campaign
In Step 6 of create / edit campaign select the Facebook page from the drop down menu
Launch the Campaign and start collecting subscribers to direct message.