It isn't just FOMO, its that when you unfollow someone it is seen by the other person has a rejection and people are loathe to reject others. Especially if the

It isn't just FOMO, its that when you unfollow someone it is seen by the other person has a rejection and people are loathe to reject others. Especially if the other person is important to you in any way, that is a problem. Muting is better, because it doesn't let the other person know you aren't following them.