With this new test, some users will be able to subscribe to Topics they may be interested in. In the News Feed, users may see a carousel of topics they can subscribe to. By subscribing to a Topic, the user will be exposed to more Pages and posts than those they ordinarily follow and interact with. Facebook intends to gauge whether this update helps users engage with posts they are interested in while also being exposed to new ideas counter to their own beliefs, interests, or politics. Should the test prove to confuse or annoy users, however, it’s very possible this update never reaches all Facebook users.