How do you get followers on Twitter?

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1 Follow everyone who follows you. It might seem counterintuitive to do this when you're focused on gaining followers, but it's a good practice because:
• People who notice that you didn't follow them back might unfollow you.
• When you follow back, some people might respond to you publicly, which will give you some added exposure to their followers.
If you're worried that you won't be able to keep up with that many people, you're right. Once you're following over 100 people, it'll be pretty much impossible to read all their updates. You'll become more selective in who/what you read.

2 Regularly unfollow people who haven't followed you back. This is especially important to avoid follow limits. The first limit you'll probably hit is when you've followed 2,000 people. You won't be able to follow any more until you have 2,000 followers. As you follow and get followed, it'll become time-consuming to "clean up" your list (unfollow people who aren't following you back). There are services that can help you with that:
• Blossome
http://blosso.me/
• FriendOrFollow
http://friendorfollow.com/
• Twidium
http://www.twidiumapp.com/

3 Follow people who autofollow.
• Follow everyone on the list at SocialNewsWatch in order to get an easy 237 new followers.
• "Twitter celebrities" are also likely to follow you back automatically.[3] Like spammers, they'll be following over a thousand, sometimes tens of thousands of people, but unlike spammers, they'll have the same number of (or more) followers. You'll stumble upon such accounts during your Twitter travels (e.g. when they are retweeted by someone you're following) but you can also do an Internet search for "most popular Twitter accounts" or "popular Tweeters".

Warnings:
• Do not send auto DMs as that may result in unfollows.
• Do not unfollow people right after you follow them. Wait at least five days before you unfollow people who don't follow back. If you do unfollow right away, you will most likely be reported as a spammer and your account will be suspended.
• Twitter has a system that detects quick and massive follows and unfollows. If this system catches you, you may have your tweets stricken from the Twitter search engine.
• If you try to follow people on autofollow lists, SocialToo will ban you from their service.