responses, or interactions, in the context of the indieweb, refer to all the different ways and things people explicitly do to and with others’s posts, from written replies to quick likes, in other words responses = replies + reactions. Common response post types are reply (comment), like (favorite), repost (reshare), and mere mentions.
See the lists on each of the specific response post type pages.
Nearly all silos support some forms of interaction.
There was some discussion to get rough consensus around what to call the set of things that is replies/comments, reposts/reshares, likes/favorites. This resulted in deciding on the term "responses" as well as "reactions".