See: https://www.w3.org/TR/activitystreams-vocabulary/#dfn-like https://www.w3.org/TR/activitypub/#like-activity-outbox https://www.w3.org/TR/activitypub/#like-activity-inbox
XAP-70 Allow to perform Likes about elements coming from other instances
XAP-71 Display Liked elements of an Actor