If you are established on Twitter and want to create a separate account for a business or for personal reasons, FlashTweet will allow you to mass follow your followers from your previous account. Instead of clicking on each account individually, this will save you a tremendous amount of time. This is a unique solution for Twitter as there are none out there that have this functionality.
You can login using your Twitter account information and you will be able to bulk follow up to 100 friends at a time (due to Twitter’s restrictions), unfollow individuals who are not following you back, display mutual friends and all of your followers. This is all done with a click of a button and then the application will send the updates to Twitter’s database to update your ‘Following’ & ‘Followers’ list.
You can simply enter another twitter users account (preferably a known person in your niche) and follow his/her friends with a click of a button. It is a huge time saver!