Adorer was a highly successful tool to build your Twitter following which, unfortunately, had its plug pulled.
It's known that liking people's tweets would sometimes return a follow back. Do this enough and you can build a decent following. But do it too much and you risk annoying people. Adorer was designed to like people's tweets very quickly but only once per person.
Until Twitter decided that it was the wrong side of borderline inappropriate the app was generating revenue with a monthly subscription.