So,it is important to clean things up periodically by removing those who are not following you back. One of reasons to do that is that Twitter will stop you from following more people if the difference between following and follower is too great. While Twitter does not post specifics on this, it is talked about a lot. And the goal is always to make sure that you have more people following you than those you are following. This is especially true as you approach the magically number of 2,000 followers. It seems that Twitter has chosen that number as the point where they limit what you can do if you are following more people than are following you.
Having more people following you than you are following should be the goal of everyone. But as you build up your following, there are going to be times where you are following people with the goal of them following you back. When Twitter stops letting you continue to follow more people, it is time to clean things up. This is where you want to identify and unfollow those people who are not following you back.
You can try and do this using the Twitter interface, but you will quickly see just how tedious this can become. But, there are a number of free solutions to aid in this area and I am going to pass on two that I work with and like. The first is JustUnfollow.com and the other is ManageFlitter.com. Each has its strengths depending on what it is that you need to accomplish.
Keeping your lists of those you follow clean of those who are not following you back is something that you should be taking a look at on a regular basis. If you are adding those you are following every day, this may become a daily process to go through. And with the goal of having fewer people you are following than those who are following you, these tools will get the job done for you.