The math behind Twitter is simple: the more followers, the more powerful you are (well, not that simple, please read on:)). It is quite natural Tweeple are obsessed with the following numbers and are ready to try various (often questionable) tactics to increase that number.
Of course, the only (legit) way to make your following grow is to make it worth it: post great updates people would love to follow. Naturally, this takes time and effort and not everyone has the patience to do it the right way.
Hence the popularity of other ("spammy") methods to make your following number grow, and here I am listing the 3 of them.
Don't get me wrong I am not going to tell you why it is unethical or bad to use them: who am I to educate you? (Besides, I have played with all of them just for the sake of an experiment, so I am kind of guilty myself.)
This post is why those tactics are ineffective and even dangerous, but it's for you to decide is you want to use them or not.
1. Automatic Following Communities:
They work the following way:
- You give it your Twitter login info and allow it to access your account;
- Sometimes you need to specify your interests (but this seldom helps any targeting);
- After that you just start getting hundreds of mutual friends day by day.
Why is this ineffective?
I have already listed a few 
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