Quite often if you follow someone they follow you back. There is software available that can do the job.
Twitter Followers gaining in most hot topics where people are always finding to get more followers.The areas over the internet where you can get some helps are "www.twidiumapp.com", "twiends" and so called other sites.This are the sites where you can gain the followers but the major concern is the communication and tweet you create.The most powerful and creative tweets better the results and followers.