@pluralistic looks out for his readers, for example the ease with which his Mastodon followers can see only the initial post of his threads if they choose: on the web, from Preferences select Filters; use the title Long thread; set Expire after to Never; check "Home and lists" and "Public timelines" for the Filter contexts; select Hide completely for the Filter action; type "Long thread" for the Keyword or phrase (minus the quotes); check Whole word; click Save changes.