Do Facebook and Instagram not have search? I don't really understand what you're getting at here. I don't see how indexing is a "special sauce"; Facebook has a

Do Facebook and Instagram not have search? I don't really understand what you're getting at here. I don't see how indexing is a "special sauce"; Facebook has a larger network size than Twitter does and as far as I can tell it indexes all of its posts. What major social sites other than Tumblr/Mastodon don't have functioning search?