I'd love to see an #ActivityPub UI that follows the original model of social network apps like Orkut and Friendster; all "friend" connections are 2-way (no following without being followed and vice-versa), and when a friend request is accepted you can see their friend list (by default, subject to the privacy settings of each user). This would be for more of a 'friends & family' use case, rather than a 'community of interest' or 'federated publishing and promotion' use case.