The quickest way to grow your followers on Twitter is by interacting with active users. This means following, Tweeting, Retweeting and so on, on a regular basis. The problem with this is that it is a time consuming and frustrating task, and aside from getting a social media manager there isn't really an easy effective way to do it yourself.
Follow/Unfollow does basically what it says in the title. By adhering to Twitters Rate Limit guidelines, we allow you to follow people connected with your existing followers and grow your Twitter presence quickly.
Twitter has other barriers such as only being able to follow a small percentage more than people who follow you so Follow Unfollow also allows you to unfollow the oldest people you have followed based on date to make room to follow new people and in return gain followbacks.
So the way to use Follow Unfollow is to simply hit the Follow People button, then once people begin to follow you back, continue to follow more and once your have reached your limits remove some before following more...easy right?