Following on Snapchat means adding someone to your friend list to see their public stories and updates. Unlike mutual friends, you can follow someone without them following you back. It allows you to view their content, but private snaps and messages are only visible if both users add each other.
When you follow someone in snapchat, that means you added them as a friend and you are able see the stories of this person. If they added you back then they can see your story as well. You can send them direct snaps as well.
