How Does Narrow Work?
People tweet. Those tweets contain words. Those words contain meaning. By targeting specific words on Twitter, we can determine which users are discussing topics relevant to your account.
Once we've identified users discussing topics relevant to your account, we interact with them on your behalf, either by liking one of their tweets or following them. This gains your account exposure with the targeted user and other users who notice the interaction.
Since we're interacting with a lot of users, we offer a clean-up feature. When this feature is on, we unlike all liked tweets after 3 days and unfollow any users who don't follow back after 2 day. If a user does follow you back, your account won't unfollow them.