Tip #8: Ask People to Follow You

Milestones or goals are great ways to get more followers. Usually people want to help out of you are trying to reach your goal of 1,000 or 10,000 whatever the case may be. Go ahead and tweet about it. "ex: I'm at 1,479 followers, please RT so I can get to 1,500 by tonight!"
Don't think it will work? Give it a shot.

Tip #6: Follow People Who Follow Back

To get more Twitter followers and get your name out there, follow as many people as you can. People will randomly shout you out for following them and others will follow you because their friends do. So go ahead, follow as many people as your can, especially the ones who follow back. (You can search for #teamfollowback, and similar hashtags as a start)

Tiip #15: Share Deals

Everyone likes to shop online, or at least look. With the internet being an abundant source for information, offer deals that people will like to take advantage of. ex: Pizza hut has buy 1 get 1 free pizza today!
A like usually helps too if its from a not so popular website or e-commerce store.
Sharing is caring!

Tip #14: Donate to Charity

One thing about social networks like Twitter is that people will do stuff (like follow) if its for a good cause. If you are a business or someone with a lot of money and can give away promotional items or money, go ahead and make a little contest or something like this: For every new twitter follower who retweets this, I will donate $1 to the American Red Cross.

Tip #13: Get Suggested on Twitter

To get an insane amount of Twitter followers, get on the suggested twitter list. You know when you first sign up for twitter and it asks you to follow 10 people when you first join, if you can get on that list... imagine how many followers you can get per day!!

Tip #12: Get Verified

Getting verified will get your more twitter followers. If you are a well known person, like a celebrity or well known person in your niche, people will search for you or recognize you from your profile picture.

Tip #11: Don't Talk About Yourself All The Time on Twitter

Yeah, you are great and you know it. Your life is amazing and also sometimes upsetting. Don't always talk about yourself and what you like to do, what you are doing and what you hate.
Imagine if you met someone at a party and all they did was talk about themselves. Would you stick around to listen and be their friend (follower) ? Maybe if their life was interesting, but lets face it, not everyone is James Bond.