Hi When someone add you as friends, you could check the message which was plurked in private. As a fan(or you called followers),you could see the message in public only. I hope it helps.
som_amethyst: Hi! Adding someone as a friend also means you can see each other’s post in your main timeline, whereas adding someone as a fan/follower is only one-sided.
Usually if people are interested in what you post, they will add you as your follower. If you have a conversation with someone or want to interact with them regularly, you can add each other as friends!