The follow for free feature enables fans that are not ready to make a purchase to follow you. Followers get a preview of your posts available to followers, send you a message and you can work to convert them to paying Subscribers.
Followers can:
Receive messages from you
Send you messages (Only if you Allow - see screenshot below)
View content you have made available to followers
Buy PTV content send in messages
View the caption of your posts
They can’t:
View any content only available to subscribers
Pay for PTV content on your wall
By default fans have the option to follow you for free however you can disable the Follow for Free button any time.
Followers can unfollow you at any time by going to your profile and selecting unfollow.