Added support for category searches, like [category:changes] or [cat:tweets]
Updated back-to links (top left in the page header, to the right of the hamburger menu) to support direct searching, rather than landing pages for the different types and categories.
Added query_snippets to the SERP itself, and expanded them to support explainers previously on the landing pages.
The new query_snippets are under development.
Under development.
Do not currently support displaying full content in search results, like some of the landing pages previously functioned.