I havent tried that system posted above.... But I have found a good method to getting followers back, in two weeks I went from 70 followers to just hit 530 today... You can read all about it in this article: http://www.infectedbybugs.com/double-your-twitter-followers/
using this system is the easiest way to get your account suspended - especially when you are successful with getting followers back ...
Most of the methods can make you upto 2000 folowers. After that twitter use a different rule set, for followers...
I don't think this is worth even the TIME! If your followers are not TARGETTED, they are NOT called followers, but "REAL BOTS ". So, according to me, it is better to have 1k real people, not 20k real bots. Maybe you are not going to agree with me, but just tell me how are these people going to help you